Originally Posted by crosbyharbison
The build quality is better and presumably the autofocus; thats about it for advantages between the two.
17-55 is your best bet. If your doing a lot of wildlife consider the 100-400 its an amazing combo on the 7D.
Both have the same Ring USM so that won't make a difference.
Both have great IQ.
Pros 17-55 are IS and f2.8 aperture
Pros 17-40 are weathersealed (with frontfilter) so it would mean a good outdoors weathersealed combination with your 7D, it's a bit cheaper.
I chose between them half a year ago, but not considering the weathersealing as important. I chose the 17-55, but nowadays I don't know becasue I also like to wander around when weather ain't so great.
Jan
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