Excerpt: I bought this as an upgrade to my 18-55 kit lens that came with my T1i. I planned on using as my everyday lens. The first thing I noticed about this is that it is much heavier than my Canon kit lens...probably a good thing (better quality), but taking a bit to get used to. In the short time I have had it, I have noticed an improvement in sharpness over the other lens, but haven't done any straight comparison shots.
Pros: Easily Interchangeable, Fast / accurate auto-focus
Excerpt: I needed a lens for doing indoor photography at a work conference. The 2.8 worked nicely and I also used my external flash I was very pleased with the photos it took and the cost of the lens made it even better!
Pros: Durable, Easily Interchangeable, Fast / accurate auto-focus, Lightweight
Excerpt: I was lucky to pick up a used version of this lens for $280 for use with my Canon 5D Mark III (as a general walk around lens).I just couldn't see myself spending $[$] for the Canon EF 24-70mm f/2.8L II nor did I have the money for it.I agree with the other comments here on sharpness. A little soft at 28 + 75mm at f/2.8. But you only need to go as far as f/3.2 - 3.5 and the softness disappears.
Excerpt: I like it- but I thought it had image stabilization. So in low light, it needs a tri-pod. Bummer for me. What would be the idle carry lens would be the 28-270 with the lower 2.8 with VI. That would be so sweet!
Excerpt: In the limited use I have had it seems fairly equivalent to the 28-135 Canon lens I had. Focus could be sharper but I really am still getting familiar with the lens. I traded off IS to get the 2.8 F stop--i think it is a lens that I will grow to like and for the price I probably can't complain. My other Tamron lens (70-200) was great!
Excerpt: While I'm not a professional photographer, I do work in the entertainment business and know my way around a camera. I purchased this to use with my 7D for both stills and video. I found both applications of the lens excelled. While not as quick to focus as the Canon 24-70 and perhaps a micro touch softer, at a 1/3 the price it was well worth the purchase. Not giving it 5 star because it's not as great as the canon, but I would actually rate this closer to a 4.5.