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I Think the 100-400L is a very versatile lens, especially on the 7D but can appreciate the beautiful shots from the 1DX and the 200-400
At web size you'll be hard pressed to see any difference between a 100-400L and 200-400L other than the better background blur of the latter if shooting wide open.
In a birding situation I see little use for the extra cost and bulk of the 200-400L except in low light situations, but in general it's too short, even at 560mm. But in a safari type situation, or shooting larger mammals, friendlier/larger birds, the 200-400L would be pretty much perfect. So I'd buy one if I was shooting in Alaska or Africa a lot say. It'll make more sense when the FF cameras aren't so low pixel density. On a Nikon D800 it'd be great, still leaving us plenty of scope to crop.
Edited on Sep 16, 2013 at 03:56 AM · View previous versions