cxr,


As I mentioned in your "canon 24-70 f2.8 IS USM" forum, I own both and like both. I have had the 17-55 for a year and it has been a workhorse, being on my 50D @90% of the time. I have not had any issue with dust. If I could only have one with my "crop" camera, it would be the 17-55. I find the 17mm much better in my house than the 24mm. My main purpose for the 24-70 was to gain the extra reach which leads to less cropping and better end results for my indoor sports photos. Having said that, I have no plans to get rid of my 17-55, it is still an outstanding lens. All charts aside, when the processed pictures are placed side by side the quality is equal.
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