I'm new to photo.net forums, and I'm very pleased by the level of the discussions I have read here. I have learn already a lot from other members questions and answers concerning digital photography. Therefore, I'm confident that you guys can help me on an important decision. I would like to know how the Nikkor 17-55mm f2.8 DX lens compares to the similar focal length Canon EF-S 17-55mm f2.8 IS USM, in terms of resolution, distortions, and other critical performance parameters, or any other considerations that in your opinion I should be aware of. I do not have any of those lenses at present time, nor any of the DSLR cameras to use those lenses either. After many years of practicing film photography as a dedicated advanced amateur in 35mm and various medium formats, mostly black and white with high quality equipment, and now closer to retirement, I'm thinking of "going digital" beyond the basic level of a "point and shoot". But I haven't decided yet between the Nikon and Canon DSLR cameras yet. I believe that learning of the differences between these two lenses, meaning the 17-55mm/2.8 zoom range from the two brands, will significantly add reasons to decide which way to go. Let's say, the Nikon D80 or Canon 30D roads. No offenses meant to Nikon or Canon enthusiasts, please. Thank you very much for any "light" on this matter.