Quote Originally Posted by neuroanatomist
Honestly, though, if Canon releases a 400mm f/5.6L IS, or better yet a 500mm f/5.6L IS, I think I'd prefer either of those to the 500/4 I or II.

John, the problem for those f5.6 lenses are that they don't auto focus when use with the 1.4X TC on a 1.6X body, sadly enough so far, anything longer than 400mm is not cheap. I think for a guy with full of money in his wallet , a big long lens is a better choice.





I have 300mm 2.8 and 400mm 5.6 but no 100-400mm, if I want to save some money, the 400mm 5.6 is my first choice, set your Tv to 1/1250 or up, the IS is not a big deal any more and of course the tripod will help. wild life subject are almost never stop moving, why IS is such a big deal?