Lower bit depth, AA filter, for two reasons. I'm sure there are others. I'd rather use a DMR though.
Actually, that's what I would normally use. However, the DMR is 10MP and the conon's are 22MP, with only 5 and 10 in the center area. Since many wildlife shots I need to crop (WDR Telyt, very few people have YOUR talent for getting close, admit it )
With this arrangement and a 60MP camera, I have 40MP where I want them not 5-10MP. In magnification terms this means 2x to 3x improvement in detail, no shabby amount.
The first shot is an 800mm image! That tells you how far I was, and yet you can see into the cardinal's mouth.
Now, with the DMR I could get closer by 2x but with the 800mm lens? I don't think so.
It was an experiment, and not sure how practical, but except for the 400mm 6.8 and the R9/DMR and Telyt like skills it is a challenge to get close to wildlife (and I don't mean guy's shooting moose crossing the road! I can do that with my M8 28mm LOL)
regards
Victor
PS
Telyt-good to see you here, and yes, the DMR is still what I would use, but more with the 400mm and 560mm 6.8's Except i FEEL LIKE A TROMBONE PLAYER. :-)