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      04-18-2012, 10:00 AM   #6
Second Lieutenant
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Drives: Space Gray e92 M3
Join Date: Feb 2012
Location: Bothell, WA

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I've owned all of the lenses in question and have used them both on my 7D and 5D Mark II - so I'll give my 2 cents.

The 17-40L is a fantastic lens but is a little soft at the corners when stopped down. This lens shines on FF, so I would pick the 17-55mm EF-S lens if you're looking for one around this focal length. It's faster and has more range - more ideal for a crop camera.

24-70 and 24-105 perform very similar, but I prefer the 24-70 because of the 2.8. It really comes down to range vs aperture, what do you need? IMO, a 24mm on a crop sensor is not that wide (if it's going to be your widest lens), so it all depends on what lenses you have currently.