Quote Originally Posted by Kayaker72
But I think I would like the extra reach of the 100-400L.

The extra reach really does come in handy!


Since deltasun showed some 100% crops of rodents, I'll do the same with the 100-400mm @ 400mm for comparison - here's the original (cropped for an 8x10" print) and a 100% crop of an American red squirrel. Noisy, because of the high ISO - but quite sharp.


[url="http://www.flickr.com/photos/dr_brain/4843589379/in/set-72157624616702164/lightbox/][/url]
EOS 7D, EF 100-400mm f/4.5-5.6<span style="color: red;"]L IS USM @ 400mm, 1/1000 s, f/6.3, ISO 3200