Canon Fixed Lenses

Canon EF 400 f4 DO IS USM Field Review


This is certainly an interesting lens, if not a new one. Introduced sometime in 2002, at the time of writing, still the only professional-grade DO lens that Canon has brought to market. The DO designation stands for diffractive optics. Canon made use of a multi-layered diffractive optic element in the lens design.

The use of the DO element saves both weight and bulk when compared to conventional lens designs. No longer a new lens, the 400 DO is still current and is still available.


Canon EF 400 DO f4 IS lens on a Canon 1Dmk4 body.

Canon EF 400 DO f4 IS lens on a Canon 1Dmk4 body.


About The Lens

Starting on the outside, the metal body feels and appears to be well-made. The lens is weather-sealed, pretty much to the same degree as any of Canons big L-series fixed telephoto lenses are.

The lens mount is standard Canon EOS, with the rubber weather-sealing ring around the outside.  The base of the lens barrel is not textured for extra grip, like many of the latest telephotos from Canon.

At the base of the lens barrel, there is a 52mm filter holder. The lens comes with a clear glass element in the filter holder, and Canon maintain that this should be kept in place when no filter is being used. I never use filters on long telephoto lenses, and make sure to keep this filter holder firmly in place, so that dust stays out.


Canon EF 400 DO f4 IS lens barrel detail

Canon EF 400 DO f4 IS lens barrel detail


The 400 DO is supplied with a tripod ring. The ring is of the old Canon design, with a hollow locking knob but it works smoothly and is easy to use. I usually attach a lens plate to the bottom of the tripod mount, for a couple of reasons. The extra length of the lens plate makes it easier for me to hold the lens or rest it when I am shooting handheld. Obviously the lens plate also facilitates quick attachment to a mount.  The tripod ring can only be removed by first taking the lens off the camera body.


Canon EF 400 DO f4 IS lens barrel detail

Canon EF 400 DO f4 IS lens barrel detail


An aluminium identification plate and a distance scale are located on the top of the lens barrel. There are also mounts for the lens strap that is supplied with the 400 DO. When bigger and heavier lenses are mounted on cameras, it is best to carry the combinations by the lens, rather than having the weight of a big lens hanging on the mount of your camera body. The 400 DO is light enough that it will work both ways.



Switch panel detail for the Canon EF 400 f4 DO IS USM

Switch panel detail for the Canon EF 400 f4 DO IS USM


A switch panel on the left side of the lens barrel houses switches for controlling AF/MF, focus distance and image stabilization. The switches are easy to use, but they protrude slightly from the panel, which means it is quite easy to accidentally bump them onto other settings. This is something to keep an eye on when shooting. Many photographers cover the switches with neoprene lens covers, which makes it much harder to bump them unintentionally. Canon’s newer lenses all have recessed switches that don’t get bumped.

The EF 400 L DO IS also has image stabilization, although in its earlier form, with 2 to 3 stops of effectiveness.


Focus ring and lens button collar, EF 400 DO f4 IS

Focus ring and lens button collar, EF 400 DO f4 IS


The focus ring is of a normal width, and textured for easy use.  I prefer the normal width focus rings over the ultra-wide rings found on Canon’s newest big telephoto lenses, which I find I have to take care not to shift accidentally.  In front of the focus ring is a black rubber lens ring that is fixed in place and is home to the lens function buttons, which can be programmed to perform various functions, depending on which camera body you combine with the lens.


Canon EF 400 DO f4 IS front element and lens button

Canon EF 400 DO f4 IS front element and lens buttons.  Click for larger view


The collar where the lens hood mounts is painted white, and it can show scuff marks from contact with the lens hood, although they are not visible when the hood is in place.  The hood attaches firmly with the locking knob and provides lots of protection for the front element, due to its depth.  There are small screws at the base of the lens hood that can come loose over time.  To prevent this happening on my EF 300 f2.8 L IS, which shares the same hood, Raymond from Cameratek applied an adhesive to the threads.  That solved the problem. There is a leather-like front cover with a drawstring attachment that fits over the back end of the lens hood when it is turned around on the lens.

Inside the magnesium alloy casing, the EF 400 DO f4 IS houses some high quality optical components.  There is one diffractive optic element, and it is positioned just behind the front element, which serves a protective function.  The diffractive optic reduces both the size and weight of the lens, when compared to  conventional refractive optical elements.  Canon claim particularly good chromatic and spherical aberration correction from the diffractive optic lens.  There are 17 lens elements in 13 groups.  There are 8 aperture blades in the lens diaphragm.

The EF 400 DO f4 IS weighs just 1940g.  It is a chunky-looking lens, relatively short, with the large lens hood making it appear bigger than it is.  All moving parts are inside the lens barrel, and there is no change in size during focusing.  The white paint coating the lens is tough, and also reflects heat when shooting in the sun.

The lens comes in a very robust hard plastic case,  that is good for storage, and for travel if space is not an issue…The case is well made and can be locked, but is quite bulky and has no space for anything extra.

The EF 400 DO has also been around for long enough that it is available on the used-gear market.


Canon EF 400 DO f4 IS and Canon 1Dmk4.  Black-backed jackal.  1/500s at f4, iso 800. Handheld.  Click for larger view

Canon EF 400 DO f4 IS and Canon 1Dmk4. Black-backed jackal. 1/500s at f4, iso 800. Handheld. Click for larger view


How Well Does It Work?

One of the things that you instantly notice when you pick up the EF 400 DO f4 IS is that it is lighter than it looks.  Despite the large diameter of the front element, the weight of the lens is evenly distributed, making it easy to manage.  It is a lens that most people should find ideal for handholding and this is one of the lenses strongest attributes.  Of course, handholding any lens with a focal length of 400mm takes some care, and requires good technique.  I found the EF 400 DO f4 IS to be a really good lens for wildlife photography




Using the lens on a tripod or mount worked well too, with the tripod collar having a smooth action and a positive locking action.  There is a black line painted on the top of the lens barrel that helps with getting the lens and tripod collar properly aligned.

The EF 400 DO lacks some of the added features found on many other big Canon telephoto lenses.  There is no Focus Preset ring, or switches for setting in a focus distance to memory.  I never use that feature in the field anyhow. There is no power focus option for video.  It doesn’t have the ultra-wide focus ring that is found on most of  the latest Canon super telephoto lenses.  This is not something that I miss, as the new focus rings are so wide that it is easy to shift them inadvertantly when using the new lenses.  I like the fact that the EF 400 DO doesn’t have unnecessary ‘fluff’ in its feature set, but has everything that I use and need.  Of course those shooters who use some of what I have mentioned here will disagree.

The constant f4 aperture at all focal lengths is a strong point.  In low light, f4 is better at gathering light than a lens with a maximum aperture of f5.6, but not as good as one that opens to f2.8.  Improvements in low light capabilities of modern sensors may be reducing this advantage somewhat, depending on your own needs.

The lens is equipped with an image stabilizer, and it has two settings.  Mode 1 is for regular handholding use, whilst Mode 2 is for tripod shooting or panning, when stabilization is only needed in one plane of movement.  The IS system is a little more audible than that on the newest Canon lenses, but not at all intrusive.

The distance limit switch has two settings.  If you are photographing subjects at a distance that is not changing too much, setting the switch to suit your working distance can bring benefits to AF speed and reduce AF hunting.  Always remember that switch and what your last setting was, as having it on an unsuitable setting can lead to confusion and disappointment.  For most of the time, I prefer to keep mine set from the minimum focus distance to infinity.  That way, should a subject suddenly appear at a closer than expected distance, I can keep on focusing on i

The minimum focus distance on this lens is 3.5m.  This means that there are a lot of other Canon lenses that will be better for photographing very small subjects from close distances.  Attaching a 1.4x extender to the lens will help a little with increasing close-up magnification.


Canon EF 400 DO IS and Canon 1Dmk4. Cheetah. 1/320sec at f4, Iso 1000.  Click for larger view

Canon EF 400 DO IS and Canon 1Dmk4. Cheetah. 1/320sec at f4, Iso 1000. Click for larger view


I enjoy the 400mm focal length for African wildlife photography a lot.  It is long enough that it can get me good portraits of wild animals, especially mammals, complete with blurred backgrounds.  It is also just enough for larger or more approachable birds.  It gives a good working distance from bigger animals, and enables me to frame well without having to go so close that I disturb the wild subjects.  And, if you are moving from an APS-C sensor camera and 300mm lens, the EF 400 DO gives similar framing on a full-frame sensor.

I work with a good number of enthusiast photographers who have chosen the EF 400 DO as their primary long lens for wildlife photography and all of them are big fans of the lens and what it does for them.


Autofocus performance was good with the EF 400 DO f4.  The focal length of 400mm is a moderate one in the world of super-telephoto lenses, and the field of view at that focal length is not so narrow that initial pick-up of subjects, especially moving ones, is too difficult with this lens.  When paired with the 1Dmk4 or the 5Dmk3, I was able to tackle the fastest of subjects with some confidence.


Canon EF 400 DO IS and Canon 1Dmk4. African green pigeon.  1/5000sec at f4, Iso 500. Click for larger view

Canon EF 400 DO IS and Canon 1Dmk4. African green pigeon. 1/5000sec at f4, Iso 500. Click for larger view


In the lowest light the EF 400 DO focused a lot slower, but was still accurate.  In the field I ended up shooting it paired with my Canon 5Dmk3 long after sunset, and it outperformed the EF 100-400L on a similar body, shooting alongside one another.  The 300 and 400mm f2.8 Canon telephotos remain the best options when it comes to focus in the lowest light levels.

Camera Bodies Used

I used the 400 DO on three different Canon dslr’s, each with a different sensor size.

On the Canon 7D with it’s APS-c sized sensor, the field of view is roughly equivalent to 640mm.  The lightweight lens combines well with medium-sized camera bodies like the 7D, which is also not too heavy.  The pair make for a powerful camera/lens combination with good resolution and AF response.  Of course the 400 DO will also work very well with even smaller and lighter camera bodies like the Canon 6D and the Rebel/700D series too.  The EF 400 DO/7D combination proved effective for smaller subjects that were far away.  Autofocus was good.  Low light performance was only average with AF and image quality.

On the now-discontinued Canon 1Dmk4, which has an APS-H sensor in it, and a field of view equivalent to roughly 520mm, I enjoyed great results with subjects of all types and speeds.  AF was fast and positive enough for even fast-flying birds, and the 1Dmk4’s resolution, and pixel pitch made this combination ideal for the wide variety of subjects that I typically photograph.

On the 5Dmk3 with its full-frame sensor, the EF 400 DO performed very well.  There is not enough vignetting to worry about even on the larger sensored camera, and AF was also fast, and accurate.  The EF 400 Do/5Dmk3 combination delivered the best AF and image quality performance in low light of the three.

It is important to define what my own expectations are from these camera and lens combinations in order to better understand my evaluation.  All of these cameras and the 400 DO will lock focus on a static or slow-moving subject, in an instant.  I don’t even consider that a real test for modern AF systems at all.  Instead, most of the shooting that I did with the 400DO involved static and moving subjects, some much faster than others, in bright light and sometimes in very low light.

Image Quality

I always shoot in RAW and process my images in Adobe Camera Raw, which is very similar to Lightroom, and Adobe Photoshop.  My evaluation of this lens’ performance with regard to image quality is based upon that workflow.

The EF 400 DO f4 IS USM is a sharp lens, of that I have no doubt.  I obtained lots of images that I was very happy with, after an extended period of real-world use with the lens.  I actually used the lens for a month of wildlife photography in some of my favourite destinations in the north of Botswana.  It is worth noting that I had to choose between my EF 300 L f2.8 IS or the EF 400 DO f4 IS for the trip…airline weight restrictions mean that on that trip, there could only be one big lens.  I did some brief testing of the two lenses side by side to make sure that I was happy before leaving my proven 300 f2.8 behind.

I got very good results from the 400 DO, and had no misgivings about using it.  Images taken with the 400 DO are not quite as sharp or punchy as those taken with either the older EF 300 f2.8 L IS, or the newest version of that lens.  However, they are still quite sharp enough for my needs, and the extra 100mm of focal length came in very handy on many an occasion.  Having more pixels on the subject is a good way to maintain high image quality, and having to crop less was a big plus for me in comparison to shooting with the 300 f2.8.

Canon EF 400 DO f4 IS, and Canon 1Dmk4.  African elephant.  1/250sec at f4, Iso 1600.  Click for larger view

Canon EF 400 DO f4 IS, and Canon 1Dmk4. African elephant. 1/250sec at f4, Iso 1600. Click for larger view


I ended up shooting the lens wide open at its maximum aperture of f4 often, and got very good results.  Whilst it may have gotten very slightly sharper when stopped down to f5.6 and 6.3, there was plenty of detail at f4, and I felt confident that I could select my aperture setting with creative intent in mind rather than being forced to stop down for sharpness.

It is been documented that the 400 DO is lacking in contrast, but I did not notice this to any great degree.  I shoot in RAW only, and process my keeper images individually anyhow, and almost invariably make contrast adjustments of some sort or another during the processing, regardless of which lens I shot with.


Canon EF 400 f4 DO IS and Canon 1Dmk4.  Malachite kingfisher. 1/320sec at f4, Iso 1600. Cropped.  Click for larger view

Canon EF 400 f4 DO IS and Canon 1Dmk4. Malachite kingfisher. 1/320sec at f4, Iso 1600. Cropped. Click for larger view


Bokeh was good, though the 300 f2.8 can blur backgrounds just a fraction more.

Colour was well rendered, even in low light.  I really didn’t notice any colour fringing and other CA’s in any of the images that I kept.  I also did not notice any vignetting with images taken with the 400 DO on the full frame 5Dmk3  sensor or certainly anything that would need fixing in processing.


Canon EF 400 DO IS and Canon 5Dmk3.  African elephant.  1/4000sec at f5.6, Iso 800

Canon EF 400 DO IS and Canon 5Dmk3. African elephant. 1/4000sec at f5.6, Iso 800


Shooting against the light the lens provided acceptable results.  It can sometimes struggle to focus when a direct light source like the sun is shining into the lens, but in this regard it is about the same as Canons other older series 1 telephoto lenses.

The EF 400 DO can also show a loss of contrast when shooting into bright, direct light but this sometimes be worked around by changing one’s angle or providing extra shade for the front of the lens.  The amount of flare that shows up with the 400 DO was not very different to what my EF 300 f2.8 IS L produced.  The new generation Canon telephoto lenses are superior by some margin when it comes to dealing with lens flare and direct light contrast loss..


This lens works very well with the EF 1.4x ii or iii extender attached.  The combination effectively creates a 560mm f5.6 maximum aperture lens.  Autofocus may slow down just a little, and absolute pixel level sharpness may also be slightly affected.  In my experience, I get the best results out of lens and extender combinations when pairing them with Canon’s 1D bodies and also the Canon 5Dmk3.  The combination worked well enough for me to use it effectively for birds in flight photography.


Canon EF 400 DO f4 plus 1.4x ii extender, Canon 5Dmk3.  Cape vulture, adult. 1/2000sec at f5.6, iso 400

Canon EF 400 DO f4 plus 1.4x ii extender, Canon 5Dmk3. Cape vulture, adult. 1/2000sec at f5.6, iso 400. Click for larger view.


It is also possible to mount a 2x extender on this lens, and if you are using a 1D series body from the last six years or so, or the 5Dmk3 with its recent firmware upgrade, then you will still have functioning autofocus, although it may be only the centre AF point.  I did not try this out myself.  I would expect quite a dark viewfinder and it would work best in brighter light.


For a similar price the Canon EF 300 f2.8 L IS ii has a one-stop light gathering advantage and faster autofocus. The EF 400 DO f4 has an extra 100mm of focal length, and it weighs around 400g less. Adding a 1.4III extender to the EF 300 f2.8 L IS ii makes for a 420mm f4 combination, with image quality similar to the bare 400 f4 DO. The weight difference becomes approximately 600g, and the lens plus extender combination is significantly longer and bulkier.

Another option is the Canon EF 400 L f5.6. The EF 400 DO f4 has a one-stop light gathering advantage, faster autofocus, and image stabilization. The EF 400 L f5.6 is 690 g lighter than the EF 400 DO IS, and sells for a fraction of the new price.

The ever-popular Canon 100-400 L f4.5-5.6 IS is lighter than the EF 400 DO IS, has zoom lens flexibility, also has image stabilization and sells for much less. The EF 400 DO has a one-stop light gathering advantage, and faster autofocus.

Canon’s just-released (at time of writing) EF 200-400 x1.4 L IS can do basically everything that the EF 400 DO can do, with the flexibility of a zoom, but it is bigger and heavier, and costs about twice as much.




Light weight and compact size for 400mm focal length

Ease of use

Fast, accurate AF


High cost


Canon EF 400 DO f4 IS and Canon 7D

Canon EF 400 DO f4 IS and Canon 7D


It may be that my own photographic preferences match up very well with the strengths of the EF 400 DO IS USM, perhaps more so than most.  I have a strong liking for the freedom that its light weight and compact size confers when shooting.  When you pair that freedom with good image quality, a decently fast f4 aperture and serious focal length, you end up with a strong combination.

The light weight of the EF 400 DO means that it may still be the ideal wildlife lens for those who like to take their pictures whilst they are out walking.  It is also perfect for nature photographers that travel a lot by air (and have to deal with airline weight restrictions).  In fact, anybody who just enjoys the flexibility that a lens with a decent maximum aperture and focal length in a compact package allows will appreciate the EF 400 DO IS USM.

About the Author:

I am a guide and a photographer, with a deep interest in all things to do with nature. I am based in Cape Town, South Africa, but travel often to wild places whilst leading photographic safaris, and enjoying the outdoors.

51 Responses to “Canon EF 400 f4 DO IS USM Field Review”

  1. Its Chris Says: June 7, 2013 at 11:52 am

    Hi Grant!
    Very interesting lecture!!! 2 years ago I reflected on this lens 400/4 DO because of its light weight. But – you know it – I bought a 300/2.8 II because of its better properties. I know, with this lens I am a little bit on the “short side”, but with an extender 1.4 III I have similar focal length available. If you compare the MTF-curves of both the lenses you can see clearly the advantages of the 300/2.8-lens. Contrast and resolution of the 400/4 DO are not as good as with the 300/2.8 II, especially in the border and extreme. Also the properties at open apertures are different, in favour of the 300/2.8, not to forget the Bokeh of 8 blades (400DO) respectively 9 blades of the 300/2.8. May be, these reflections are too theoretically. But – if weight is decisive and not image quality – the 400 DO can be a good alternative for wildlife photography in my opinion. Hope you agree.
    Regards to Helena and you

    • Grant Atkinson Says: June 7, 2013 at 3:37 pm

      Hi Chris
      Thanks for your response here, and your choice of the 300f2.8L IS ii is a good one. I definitely agree with you on that, and my own workhorse lens for wildlife photography when guiding is the 300 f2.8 too. At the same time the EF 400 DO still offers an alternative, and a good one at that too, with its biggest advantages being weight, and compact size making it very easy and pleasant to use. It is not quite as good as the EF 300 f2.8 when it comes to AF speed, or image quality as you say :-). Still good to have choices, and both setups are good enough to do the job well. Thanks also for the regards, the same to you and Anne 🙂

  2. Filippo Righi Says: June 7, 2013 at 12:18 pm

    Thank you for the review! This is a good lens!

  3. Nancy Says: June 7, 2013 at 5:37 pm

    Another very clear explanation. So much so that I’d go out and buy one today!

  4. Nancy Says: June 7, 2013 at 5:39 pm

    That is if I had the extra cash!!!!!

  5. Buddy Eleazer Says: June 28, 2013 at 6:16 pm

    Interesting to read your review. As you may recall, I also have the 400 DO and used it when we were together in Chobe/Kasane. On my last two trips to Timbavati, I’ve used the lens on the 5D MkIII and find that combination to be the right length for most of my shots in the lowveld bush. On the trip to Chobe, it was often a little short without the 1.4x TC, In that open space and with the nice mounts on the Pangolin photo boat, it would have been nice to have my 500mm f/4; however, the light weight of the 400 DO even with the TC made handholding for birds in flight quite easy … and I struggle to do that with the 500mm. Overall, I’m really pleased with the trade-off of weight to telephoto length in comparison to other options. I could see where a mix of having this lens and the new 70-300L would work really well together on a full frame body.

    • Grant Atkinson Says: June 29, 2013 at 1:18 pm

      Hi Buddy
      Thanks for your feedback, especially as an existing and very satisfied owner and user of the 400DO that you are 🙂
      I have also found the 400 DO to be almost an ideal focal length for many of the wildlife areas that I get to shoot in. It really is nice to have that extra 100mm over the 300f2.8, combined with its compact size and light weight. Really makes shooting effortless and fun, which is important when you get to shoot a lot as I do. Although I don’t own a 400 DO, I certainly would like to have one in my lens bag…
      I have also been seeing some of the great results you got from using the lens on your FB page…so thanks again for chipping in here with your valued input!

  6. Mike Says: July 16, 2013 at 7:37 pm

    Thanks Grant for an excellent review.

    Specific question for you.
    Which is the sharper perfomer at 560/600:
    400DO with 1.4 TC or 300/2.8 (IS I or IS II) with 2.0 TC


  7. Grant Atkinson Says: July 16, 2013 at 8:48 pm

    Hi Mike
    Thanks for the feedback. I would have to say that the 400DO performed really well with the 1.4x extender version ii on it, better than my EF 300 f2.8 IS does when fitted with the 2x extender version ii, sharpness quite close but AF performance more accurate and faster with the 400f4 and 1.4x extender. The 2x extender, old or new, always slows AF down for my own liking and I tend to get lots more hunting with it when shooting fast moving subjects.
    I have not yet had enough time to confirm this but I would suspect that the newest EF 300 f2.8 IS ii when mounted with the new EF 2x extender iii that the two lenses would be closer or that the new 300 plus 2xiii would have the edge, slightly? I am planning to get more time in the field with the new 300f2.8 and extender quite soon and will revisit the subject…

  8. Frank Says: October 6, 2013 at 10:16 pm

    Grant a great review thankyou for taking the time, I’m a big believer in the lighter the lens the more keeper shots. I know with the larger lenses you have the obvious reach, however I can tell you the more spectacular shots (in close) IMHO are made from having the freedom to move quickly. I use the Canon 400mm F5.6 in the field and more than once the subjects have totally surprised me, without a light lens I would never have been able to get “THE SHOT” again your attention to light lenses has not been overstated. I think the Canon EF 400mm DO with a 1.4 ext. is another great tool. Thankyou, Frank

    • Grant Atkinson Says: October 22, 2013 at 10:37 am

      Hi Frank
      Thanks for your comment. When I am choosing equipment for my own use, I always place a value on light weight…I also do lots of flying on airlines to reach some of the places where I work, and there too, lighter weight is super valuable to me. Totally agree with you on light lenses also allowing rapid reaction for those unexpected shots….whenever possible I prefer to be able to handhold whatever I am shooting with.
      The 400DO is very light, and very easy to use well, and I believe that similar results can be expected from the EF 400 L f5.6, although I have not yet gotten to use one of those for any length of time. A full field review of the EF 400 L f5.6 is somthing I hope to be able to accomplish sometime early next year.

  9. Nicki Says: December 31, 2013 at 11:35 am

    Hi Grant,
    I currently have the 1D mk4 with the 100-400 lens. I only really photograph birds and find the 400 reach just isn’t enough sometimes. I have the 1.4 mk iii and 2 mk iii converters but they don’t work well with my lens and I’m hopeless with manual focus anyway. My fellow birders have been differing in opinion between the 300 f2.8 and this lens. I’ve decided to opt for this one (have just placed my order) since it’s much lighter (I’m a slither over 5 foot tall) and will mean I should be able to manage hand held flight shots. I found your reeview really helpful, particularly since I’ve seen some negative ones, so I’m confident I made the right choice.
    Many thanks

  10. Grant Atkinson Says: January 2, 2014 at 10:29 am

    Hi there Nicki
    Thanks for sharing your current experience here, and your gear plan. I think that when it comes to compact size, and ease of handling, specially for smaller shooters ,that the 400f4 DO is an especially good lens. It really is so light, and so much fun to use because of that manageability, that you should do well with birds in flight.
    The 400DO also works very well with the 1.4x EF extender in place.
    There will always be comparisons drawn between the EF 400DO and the EF 300f2.8, but for compact size and light weight, the EF 400DO is pretty much unbeatable, especially if the 300f2.8 has an extender in place.
    There are a good number of very happy EF 400DO shooters out there and I hope it works as well for you.
    Let us know how it works out for you

  11. Luke Says: April 17, 2014 at 12:41 am

    Hi Grant,

    Thanks for the great review of this lens. I currently use a 300mm F4 L, but I am thinking of upgrading to the 400mm F4 DO. A friend of mine has let me borrow his for me to try out. Everything is great, except that I cannot get my Canon EF 1.4x II extender to fit. Have you ever experienced any such difficulties? Is there a trick to it that I cannot see?

    Kind regards,


  12. Grant Atkinson Says: April 17, 2014 at 6:39 am

    Hi Luke
    Thanks for your feedback. I am surprized to hear of your difficulty with mounting the EF 1.4x extender. I have used the 400DO quite a bit with the 1.4x extender attached, both the vii and viii.
    Maybe just inspect the lens mount for any burring or slight bending or damage to the aluminium plates in the lens mount, and do the same thing on the extender mount. Also, make sure there are no loose screws in the bayonet mount on the extender (there should be 4 of them) that are projecting out a bit?
    Cannot think of anything else other right now, and if the mounts are in good shape, then perhaps something in one of the mounts is slightly distorted, perhaps from a fall or heavy bump?
    Hope you get it figured out?

  13. Johannes Ferdinand Says: April 17, 2014 at 3:30 pm

    Hi Grant,
    excellent review which basically fits my experiences as well. I am still very happy with the Canon 400mm f4,0 DO. It must certainly be taken into account, that the combination of the lens with a Canon 1D series is the real. Whether someone agree on the value for money everybody has to test on basis of personal applications/ preferences and his/her financial capabilities. The – little – review I wrote, you will find here: with more testing/ remarks on flight shots:
    Just one problem I had to fix at Canon Germany. Fortunately just before the warranty period I brought the 400 DO to the servicepoint at Canon Germany. The main tube and the focusing housing were not tight any more. The screws went loose during the rides in the desert of Oman. There were no optical or AF-imperfections but I thought, that before the DO will completely falling apart I get it fixed. In the meantime, I realized that I was not alone with this problem. Thus, I thought it should be communicated.

    • Grant Atkinson Says: April 17, 2014 at 4:48 pm

      Hi Johannes
      Thanks for your links, I enjoyed seeing the images, especially difficult to get are some of the blue-fronted parrots against the green forest background. Also enjoyed reading your review, and your point is a good one about the EF400DO performing better with a 1D series body than perhaps with lesser Canon bodies. I found it equally good when used with my Canon 5Dmk3, and I was even quite comfortable with the 1.4x extender and the 5Dmk3. I think that the extra sensitivity in the AF systems of the 5Dmk3 and 1DX help AF performance in some of Canon’s older lenses quite noticeably.
      The EF 400 DO that I have used, has done lots of work on a boat offshore for pelagic birds, as well as many African safaris, and didn’t yet experience any loosening of internal parts, but it is normally transported in a Pelican case for protection.
      I think you describe very well your own requirements for lightweight and compact size in your review, and the 400DO is well suited for that type of application.
      Thanks again for your contribution here, and as you say, the price of this lens means that it will not be a natural choice for everybody….

  14. Terry B. Says: August 30, 2014 at 9:27 pm

    Hi Grant,
    Thanks for the great review of this 400 DO lens. I just purchased the 400 DO and needed some info on it . After using my wonderful 300 f/4 IS for a good while , and loving it. I wanted to extend my focal length in a prime . I really need IS on my lenses and the f/4 seemed fine, to me. I couldn’t afford to go any longer , so found a used , clean 400 DO. This was my most expensive lens I’ve ever purchased and I had high hopes for it. Took it out and tested it on some lake ducks, etc. and was very pleased with how it handled (tripod) and it’s IQ on my 7D. Next will try it on the 5D3. I feel like I’ve arrived and am excited to own this great Canon lens. To bad I didn’t get it in time for my recent Alaska trip but the 300 and 1.4X worked well. I believe this lens will be with me for a very long time.

  15. joan safont Says: September 14, 2014 at 8:23 pm

    Hola Grant.
    agradezco tus comentarios con respecto a esta gran lente de Canon. Trabajo con El 400mm f2,8 de Canon que considero uno de los mejores objetivos de CANON,pero en viajes a zonas algo accidentadas como las costas de Inglaterra, Irlanda o Escocia donde el peso es muy importante utilizo mi 400mm f4 Do. Es excelente su calidad y manejabilidad he hecho pruebas desde hyde con dos camaras iguales y los dos teleobjetivos y los resultados son muy parecidos. En multitud de comentarios leidos en la red las quejas son de falta de contraste. Si se usa con el parasol que incluye no se aprecia falta de contraste. Es una verdadera joya y lo recomiendo a quienes no puedan acarrear el peso del 400mm f2,8. En moda y publicidad tambien me ha dado un buenísimo resultado.

    • Grant Atkinson Says: September 20, 2014 at 3:41 am

      Hi Joan
      Thanks for sharing your feedback on using the 400 DO in real shooting conditions, and your good experience provided by the lens..that is exactly how I found the 400DO to perform for me as well.
      I am looking forward to seeing what the newest version of this lens, just announced, can do!

  16. Robert Says: September 29, 2014 at 7:34 am

    Again your blog influences heavily. I’m currently awaiting a pre-order for the Canon 400mm Do II.
    With it or in the same time frame a 7Dii.
    I think I’ve read about the limitations of the first gen 400mm DO and think the Mk II can only be better even if only incrementally.

  17. Oliver Says: October 5, 2014 at 6:34 am


    Have you had a chance to try out the 300 2.8 IS II and 1.4x TC III combo? I’m thinking about getting the 400DO II or 300 2.8 IS II+1.4x TC III. The new 400DO II’s MTF charts looks a lot better than the older 400DO, and very close to the MTF of the 300 2.8 IS II

    The 400mm range is something I will be using a lot so the DO II’s 400@f4 and 420@f4 from 300+1.4TC III both suit my need, and they are priced similarly. The pros of the 300+TC is the flexibility and ability to shoot at 300 2.8 if needed, while the 400DO II may have an edge on IQ and AF speed compared to the 300+TC.

    I know it’s still too early to say anything about the new 400DO II, but I am more concerned about IQ and not so much about weight, do you think it will be better to get the 300 2.8 IS II and 1.4x TC III, or the 400DO II? (Another concern is AF speed between the 300+TC and 400DO II)



    • Grant Atkinson Says: October 7, 2014 at 11:34 am

      Hi Oliver
      You have described the main differences and points of close comparison between the two lenses very well in your text above 🙂
      I have used the 300 plus exteneder 1.4ii combination, and i think that we are going to have to wait for the EF 400DO to land and get into real-world use before making a call between those two.
      Comparing the same lenses and extender in their version 1 form, I would have to say that it was quite difficult to choose one over the other. My own preference would be to have the 300 f2.8 with no extender, which has the best AF, and the best image quality, then the bare 400 DO, and then the 300 plus 1.4x version 1.
      Of course, that doesn’t take into account that 400mm might be the ideal focal length for your style of shooting. I am hoping to get hands on a 400DO mk2 for review and comparison purposes but no confirmation on a date for that yet from Canon South Africa but i will keep on updating this site.
      Kind regards

  18. Marek Grote Says: December 5, 2014 at 8:32 pm

    I might buy a used 400mm f4 DO that is missing the tripod collar. Would it be possible for you to measure the diameter of the tripod collar? Thanks

    • Grant Atkinson Says: December 6, 2014 at 1:42 pm

      Hi Marek, unfortunately I no longer have the original 400 DO on hand to be able to make a measurement..sorry about that.

  19. Ken Pride Says: December 17, 2014 at 12:15 am

    Hi Grant:

    I am looking forward to your review of the 400 DO II, as I am going to purchase a big tele to go with my new 7DII. I have rented the 400 f2.8, 300f2.8 II with 1.4 and 2.0 TCIII’s, but not able to rent the 500 f4 yet. I found the new 400 f2,8 II much lighter than the older version and it takes TC’s very well. My subjects are birds, BIF’s and wildlife. Mounted on a 7DII the 400 f2.8 becomes a 640 f2.8. The 300f2.8 + 1.4TCIII is a very portable 420 f4. but might be a bit short for small birds. The 400 DO II might be the best compromise but I am concerned about sharpness/IQ, particularly with 1.4TC attached.



    • Grant Atkinson Says: December 17, 2014 at 3:01 pm

      Hi Ken, thanks for your interest. I am scheduled to have an EF 400DO II for testing purposes sometime in early Januar 2015. From what I have seen of Canon’s new telephoto lenses, both fixed and zoom, in the last few years, and the resolution charts that go with them, I have a lot of confidence in how well the new EF 400DO is going to perform. My expectation is that the EF 400DO II is going to be sharper, and focus faster than the original model (which is a decently good perfomer in its own righ) and will not give away much at all to the other big Canon super tele version II lenses. I also think it will work very well with a 1.4x iii extender as well..
      Looking forward to the lens and the field testing

  20. Robert Says: December 17, 2014 at 2:52 pm

    I’ve received the 400mm DO II just 2 days ago. Grant was a big influence in this purchase with his review of the 1st generation. That, and my age, and not needing or wanting to carry heavy lenses. I have the 300 F2.8 and can favorably compare the 400 DO II to it. Of course a stop of light is lost but 100mm of FL is gained and at least 8 ounces lost. Here is one of the first photographs taken with this lens with a 2.0 TC:
    I’ve yet to use the lens ‘bare’ yet or with the c1.4TC, but with the cTC2.0 results I’m sure they will be fine.

    • Grant Atkinson Says: December 17, 2014 at 4:35 pm

      Thanks for that news Robert,
      I am very excited to see the new 400DO ii and do some shooting with. Great news is that you have the 300f2.8 on hand, and that the two lenses are comparable in their performance for your shooting requirements. The image of the flicker/woodpecker on Flickr looks to be nice and sharp and specially noted that it was shot with the 2x extender, and with good contrast..please keep up posted on how you do with the lens.
      I will be looking to do as much shooting with the new 400DOii in January, when they reach South Africa, as I can, and get my review on here shortly thereafter 🙂

  21. Randy Hartwig Says: December 19, 2014 at 4:08 pm

    Grant, I would like to thank you for one of the better if not most enjoyable reviews of this lens; because of this review I have ordered and hope to receive it today. Thanks for some of the best reviews on the web.

  22. Bharat Says: January 26, 2015 at 6:32 pm

    Dear Grant,

    Thank you for sharing your experience and knowledge and some nice photos; the green pigeon in flight and the kingfisher are exceptional! Who’d want any other lens if one can achieve this with the 400 DO ver 1!?

    That said, may I request you to educate me and clarify 2 points:
    1. Front filter. This lens should see a lot of use in dusty and field conditions. I see no mention of any protective front filter. A big risk for an awfully expensive lens – at least for the likes of me! Will a front filter severely degrade the image? If not, can you advise – what is the filter size? UV or skylight 1A – which will prove more appropriate?
    2. Use of those 4 black circular lens buttons at the front end of the lens you mentioned in passing in your review (image 6), but did not explain in detail. Can you please explain how to use them on a 5D II?

    Thank you so much!

    Bharat Shahane

    • Grant Atkinson Says: January 27, 2015 at 6:29 am

      Hi Bharat,
      Thanks for the feedback.
      1. As for your questions, I dont actually know what the front filter size would be and I am not even sure if you can fit one. There is what looks like a thread on the inside of the collar around the front end of the lens, but is probably just strengthening ridges or to do with gaining access to the inside of the lens itself. I have never seen anybody using any kind of filter on the 400DO, or similar lenses like the EF 300 L f2.8. The lens hood for the 400DO is very deep, and completely effective at protecting it. From the end of the hood, which has a rubber edge to it, to the front element, is around 14 cm deep.
      I use my lenses like this in dusty conditions almost all the time, and I have never had a problem with it. I just keep it covered whilst not shooting, and blow the dust off each day with a hand blower.
      2. The black circular buttons can be used for different purposes depending on what Canon camera body you are using. Although there are four buttons, they all do the same thing, and are spaced around the lens so you can reach them from any angle or grip. The default setting is usually to stop autofocus whilst you hold a button in. This enables you to work in Ai Servo focus mode, but merely push in one of these buttons to lock the focus, for those times when a focus point does not match your composition. As soon as you let go of the button, the focus works as normal once again.
      On the newer Canon bodies, the possible options for using those buttons has been expanded, from starting IS, to switching between Ai Servo and One Shot, and more.

      I am currently working on the review of the EF 400 DO mk ii.

  23. Robert Says: January 27, 2015 at 9:56 am

    Very much looking forward to you assessment of the 400 DO ii. At this point I’m completely smitten with it. Recently I’ve added the 100-400 Mk II and have recently taken both on a trip. I kept the 100-400ii on the 5Diii for possible sudden close encounters and the 400 DO ii on the 7Dii for the further shots……it is a great combo. Also another pleasantry with the 400 is its ability to take a cTC2.0. Even if I could afford an 800mm I couldn’t carry it. The IQ will always take a hit with the 2.0 TC but not nearly like I feared.
    For any salivating while waiting on Grant’s view of the 400 DO ii here are links (if Grant allows of course) to to pics via the 400 DO ii, first with cTC1.4 and second with cTC2.0, just note the shot with the 2.0 TC was at great distance.

    • Grant Atkinson Says: January 27, 2015 at 10:11 am

      Thanks for the links, Robert, and the real-world feedback. I have also been in the field with a similar gear arrangement to you, the 100-400mk ii for a general purpose zoom on a 5d3, and then I had both the new 400 DO mkii as well as the EF 500 f4 L IS ii on hand, with a 7dmk2 and another 5d3 body. I have not used the new 400 DO in the field for long enough yet to complete a review, but so far, it seems to be an excellent super tele lens. I have used it only with the 1.4x iii extender, so your images with the 2x extender are of added interest.

  24. Bharat Says: January 27, 2015 at 10:54 am

    Dear Grant,

    Thanks so much for the detailed explanation. Much appreciated!

    Happy shooting with the new DO Mk II…! A side by side comparison shooting the same subject in real life field conditions without any post processing or editing (maybe original JPEGs?) may really help understand the quality difference between the the two versions. Look forward to it!

    The best!


  25. Barry Treleaven Says: October 30, 2015 at 9:36 pm

    Thank you for your detailed review of the 400 f4 DO Mk1
    I purchased a 2 year old lens in mint conditions and it is everything you succinctly described,
    early day’s yet but you helped sorting out the wheat from the chaff regarding this lens.
    Barry Treleaven

    • Grant Atkinson Says: October 31, 2015 at 6:42 am

      hi Barry
      Thanks for your feedback. I like the original 400 F4 DO a lot and found it a great lens to use. One thing which is not in my review, but that I have heard from a few users/owners in the interim, is that the original 400 f4 DO IS can be susceptible to some loosening of an internal section within the lens barrel. I never experienced that, but perhaps if you carry the lens in places where it gets subject to lots of vibration and bumps, it might be worth having it checked over by Canon from time to time.
      Good luck with the lens and hope to see some images that you get with it.

  26. Indranil Goswami Says: December 25, 2015 at 5:14 am

    Hello Grant,
    Thanks for your detailed evaluation. I was hesitating as it did not have a red ring but after reading your report I decided to go ahead and buy one. So far I have been using the 70-200 2.8 IS with either the 1.4x or the 2x for wildlife. The 1.4x was ok but I was not satisfied with the 2x on it. As I live in India, most of my trips are to the national parks and photography is from open vehicles. I often found the 70-200 on the shorter side and needed a light and compact lens with a little more reach.

    • Grant Atkinson Says: December 26, 2015 at 10:51 am

      Hi Indranil
      Thanks for your feedback, and I have also been using the new EF 400DO mk ii quite a bit recently but not completed writing up the review as yet.
      I found the original EF 400 DO IS USM to be much better than any combination of extender and zoom lens like the EF 70-200 f2.8 etc….
      Contrary to some other users experience, I also found that the lens performed quite well for me, that is the 400 DO IS USM (original) with the 1.4x extender from Canon, although I only used that combination on full frame camera bodies or the 1Dmk4 – not on APS-C sensors.

    • Bharat Says: December 26, 2015 at 2:02 pm

      Dear Indranil,
      Just read your post. Seems we have a common interest – wild life with a 400mm… hand held!
      Would like to have a chat with you, if you agree. May I have your email please? Mine is

  27. Bharat Says: December 26, 2015 at 2:09 pm

    To: The Moderator:
    I just wrote to Indranil. I included my email address with a view to contact him and discuss the practical aspests of handling this lens. (It is tedious to write long dialogues; more efficient if one can talk directly.) I gave the address voluntarily and I see no reason why it should be blocked out. Kindly let it pass. Thanks!

  28. Willie Hinz Says: May 24, 2016 at 12:42 am

    Grant thanks for all the insight into this lens . I’m taking my 400 F4 DO to Kruger in July. Would you use the image stabilizer when on a monopod from Land Cruiser? Is so. What setting would you set it to?

    • Grant Atkinson Says: May 24, 2016 at 6:09 am

      Hi Willie, if the Landcruiser will have other people in it, who may be shifting or moving around, then I would make use of IS, just put it on Mode 2 when you have it mounted on the monopod. By Landcruiser I assume you are referring to a game viewing vehicle where you will sit on bench seats and in rows, and the monopod foot will be on the floor of the vehicle.

      For regular handholding with this first version of the lens, make use of Mode 1.
      Hope that helps

  29. Willie Hinz Says: May 24, 2016 at 6:49 pm

    Thanks for your advice. Yes probably 5 more people on the vehicle. I’m leaning to have my 100-400 Is II in my 5DmrkIII(mostly handheld IS on 1 ) the 400 F4 DO on my 7D Mrk II (monopod IS on 2 ) for longer shots and bird, and 17-55 F2.8 on my 70D for closer shots and video. I’m trying to to change lenses while on the vehicle .

    Any advice would be deeply appreciated. That great migration trip sounds very interesting.

    Thanks again

    • Grant Atkinson Says: May 25, 2016 at 2:33 pm

      Hi Willie
      It sounds like you have things pretty well covered. I am sure that as you go along you will quickly get a feel for how well the monopod is working. Some safari vehicles also have armrests or bars that can be quite useful for resting on, perhaps for certain angles. I always look for those kind of things that can help me keep my gear steady. Make sure to keep your shutter speeds fast as well, like minimum around 1/800sec if you can, if you are struggling with other peoples movement in the vehicle. When using monopods, I also make sure to not keep the lens on the monopod upright with the foot on the vehicle floor, when the vehicle is running or driving along. Vibration is transferred directly from the floor to the lens and camera that way…have had some camera mounts shake loose in a day or two that way…

  30. Byron Porter Says: April 22, 2019 at 4:55 am

    Aloha Grant!
    Your reviews on the Mk I and II versions of the 400DO have been very helpful to me in formulating a glass acquisition plan. I’m currently shooting with a 300F4 and the Mk ii 1.4 and 2.0 TC and I’m reasonably happy with the results, but I know that I am working in a restricted envelope. I am also working within a financial budget.

    I had been planning on adding a 300 2.8 IS v1 and the Mk III TCs. My understanding is that while my focal length wouldn’t change, the image quality would be better across the spectrum. However, over the past few months, I have discovered that even 600mm is not sufficient for some of the bird photography that I have tried to engage.

    Enter the 400DO. My plan would be to add the 400 DO IS v1 instead of the 300 2.8 IS v1, gaining the extra length and sacrificing 1 f-stop. If I understand the reviews, the VII of the 400 DO is as good as the 300 2.8. Am I correct in thinking that the original 400 DO would still be effective tool using the latest TCs?

    Is the AF performance of the original 400 DO on par with my 300F4?

    For bodies, I primarily use a 7Dii, which I understand would loose some AF capabilities with the 2.0 (I experience that with my 300F4 also).


    • Grant Atkinson Says: April 22, 2019 at 11:48 am

      Hi Byron
      Thanks for writing. These days the EF 400 DO v1 and the EF 300L f2.8 IS are about the most reasonably priced way to get into Canon super telephoto range of lenses.
      I also used to own the EF 300L f4 IS, and had two copies of it. I would say that the EF 400DO IS i would focus faster than that lens, in my experience of using both, and also more accurately. As I related in the review, I did not find that the image quality of the original 400 DO was lacking, and if some folk found that the lens showed less contrast than some other Canon super telephotos, its quite easy to add contrast in editing. Again that was not my own finding. I found the original 400DO to be very effective with a 1.4x extender in place, specially when paired with the 1D Mark 4 and the 5Dmk3 bodies that I used it the most with. I did not use that combination much with the 7Dmk2 but would expect it to focus reasonably well. I do think that if you add the 1/4x extender to the original 400DO and use it with a crop sensor Canon camera then you will get your best image quality results in good light and at iso settings between 100 and iso 800.
      With the 2x extender you may be limited to using Live View for focusing or the centre point, when combining a 2x extender, original 400DO and 7D Mark 2 (and as I dont currently have access to an original 400DO i cannot test that).

      Hope something there is of help to you

      • Byron Porter Says: April 22, 2019 at 2:10 pm

        Thank you sir! There is most definitely something of help to me in your comments!

  31. Bharat Shahane Says: April 22, 2019 at 12:33 pm

    Hello, all!
    Reading Grant’s last post on the 400/DO v.1, I quite second all he says, except the faster focusing speed relative to the 300/4 IS. Personally I found the 300/4 faster and very accurate. But that could just my good luck in having such a copy.

    An important aspect I wish to add to this discussion: Using a 24mp FF camera (5D mk IV) and then cropping image by 50% (=12mp file) or using a 24mp crop sensor (7D mk II) ab initio with no further cropping (=24mp file): Which is a better option? Which will give better results?

    Next: I think it would be a better idea than either above options to buy a FF Sony A7R II body with a 42mp sensor + Techart v. III or Metabones v. iv/v adapter and using the 400/DO on it in crop mode = 16mp image with far better image quality than the 7D series offers. Focussing speed may suffer somewhat as may focussing accuracy a bit (crucial for flying birds or hyper active subjects); even so the final result will be far superior to using a Canon body+ Canon lens.

    Yet another option is a Sony A7 Mk III + Sony FE 100-400/5.6 lens. Very hand holdable. Quality at par with the the 400mm/DO v.1 for all practical purposes.

    • Grant Atkinson Says: April 22, 2019 at 2:50 pm

      Thanks for that input, Bharat
      With regard to the 5D Mark 4 (30 megapixels) and 7D Mark 2 (20 megapixels), I have done a comparison of those cameras image quality relative to one another, as full frame and cropped, in a post comparing them with some other mid-range Canon cameras. Cropping the 5D Mark4 image until the subject size matches the image taken with the 7D Mark 2 will leave the 5D Mark 4 user with approximately 13 megapixels. So the resolution advantage is with the 7D Mark 2 but for many purposes 13 megapixels may be enough. When it comes to the image quality of the cropped 5D Mark 4 versus the uncropped 7D Mark 2 my own preference is for the 5D Mark 4 but the difference is not that great. There exists a big difference in image quality if the 5D Mark 4 image is not cropped. But in the case of Byrons question, getting the 400mm lens will be the best way to gain more magnification.
      If a user is after fast-moving subjects then the third party adaptors are not going to work very well and usually the don’t allow the autofocus of the camera to work quickly enough.
      Images I have from using the Sony FE 100-400 f5.6 lens are definitely comparable to the images from the original EF 400DO but it is still one stop slower, which makes it more difficult to successfully use an extender for fast moving subjects.
      The A7 Mk iii has full frame resolution of 24 megapixels, so it offers less cropping leeway than a 5D Mark 4. The Sony A7R iii (42 megapixels) would be a better choice for high resolution and cropping leeway, but the original poster mentioned that he had a budget to work with and the A7Riii is one of the more expensive Sony bodies.

  32. Bharat Shahane Says: April 22, 2019 at 7:14 pm

    Dear Grant,
    Thanks for your more knowledgeable inputs; all points accepted, except…. !
    There is leeway to discuss one important aspect you refer to: Price of eqpt –
    Canon 7D mk ii + Canon 400/DO v. 1 vs. a Sony A7R iii body + Sony FE 100-400mm lens. Should not be much of a difference, if all are new. Let’s not forget buying the Canon set means adding a 100-300/5.6 L optic to be even with Sony’s 100-400 range. If calculated thus, overall the Sony set should come out cheaper.
    Not to forget – my experience suggests the sensor and image quality of a Sony A series outstrips most Canon sensors by a fair margin.
    The best!

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