I have only used the 100-400 and I must say I loved it. Sharp images at f5.6 on my 5D. IS works like a charm and I kinda like the push-pull zooming.
Originally Posted by Carbonator
Just to be clear: that would mean 500mm focal length and like f8 minimum? You're really gonna need some ISO or good OS in that case. If you're planning on shooting live animals, f8 won't make it a lot easier for you.
So I can't make a verdict, because I never used the Sigma, but I do think cropping to 500mm without needing to push the aperture a stop could be an advantage as well.
Good luck with whatever you end up with!
Jan
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