« on: May 31, 2011, 10:30:37 AM »
The 24-105 is more than capable of producing very nice images with nice bokeh. Some of the main complaints of the 24-105 are slight distortion at the 24 and pincussion at 150, however as I said, for most everyone, unless you shoot architecture and doing a lot of "photo stitching" then, that really isn't that big of a deal for 99% of everyday shots. The 24-70 is/was a very nice lens, but image quality, doing side by side shots in my studio for commercial work, when I tested them, I didn't see any appreciative difference between the 2 lenses to justify the extra weight and strain I would have to go through to use it and hand hold it (with my 2 camrea system). Dont fret about purchasing either lens.
Regarding the 15-85 suggestion... There are a few reasons to choose the L over this lens and a few visa versa... first of all, in favor of the L (either one) is fully weather sealed and construction. The L's are built like a tank. Secondly, while I dont care one way or the other, but the constant F2.8/4 aperture throughout the range. On the 15-85 it's 5.6 at the 85 range vs on the 24-105, at the 85 range it's still F4. At the 105 range the L lens is a hair sharper all around. Lastly, it can work on any canon EF camera (crop or non-crop). If at any time you upgrade/borrow/whatever another camera you can be 100% sure you can still use your gear.
Now with that said, the cheaper lens is still less weight, easier to hold, not as high profile, sharper in the corners at wide angle and compared to the two, should your 15-85 break you wouldn't be as much out of pocket as the 24-105 or the 24-70 for that matter. Keep in mind, Canon has and is using a 3 tier system on lenses... a cheap consumer lens, 15-55, a mid-range semipro lens, 15-85, and then pro series 24-105 or even the 17-55. They have this symmetry throughout the lens line up from the 50mm's, to 70-300's etc... They even do that for the cameras... rebels, xxd, xd. There's no knock on however uses the inexpensive versions however they are seen to be more of a jumping off tool or a reason to upgrade tool to get your feet wet and then start longing to upgrade.