On a 1.6x crop factor camera like the Canon 350D/20D, the effective area of this lens is equivalent to a 27-56mm lens on a old school film-based SLR camera. As I come from a background of extensive 50mm lens use, I find this to be my most common working range (and I have four other excellent lenses in my bag to choose from).
My reason for purchase was to replace the pathetic kit lens that comes with the 350D. The Tamron is a much faster lens at f/2.8-4, and as it is designed for full-frame SLR use, the photos you'll get on a 1.6x crop factor camera are outstanding. The edges are sharp and just as bright as the center. In fact, the images produced with this lens are so sharp that you'll find yourself reducing the in-camera sharpening for portraiture. Additionally, my photos show great contrast and need very little--if any--post processing.
I do have a few complaints about this lens. First, the lens hood's diameter is enormous (over 4"), and I wish there were a smaller hood for 1.6x crop factor camera use. Second, like all Tamron lenses that I have encountered, the manual focus ring moves during autofocus. Third, the focus should be faster and much quieter. However, in light of all the positive aspects going for this lens these are minor issues.
Reviewers on other websites have given this lens outstanding marks, and it was only after careful research that I decided on purchasing it. I was then off to Thailand where this lens truly proved its worth.
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