Compared, the Canon EF100-400L and the Canon EF 70-200 f2.8L IS II plus 2x EF III extender

When it comes to mid-range telephoto zooms, Canon users have some choices. The EF 100-400L f/4.5-5.6 IS has long been a top selling lens. Recently, with the launch of the latest Canon EF70-200 f/2.8 IS II zoom, and the Canon EF 2x III extender, this combination has [...]