Evaluation: 
Conclusion: MAKE SURE YOU CAN RETURN IT, 2ND ONE IS GREAT!!
Review: Review of lens based on Canon 40D:
Be sure you can return it because the first one I got was pure junk. All of the images at 70mm f2.8 where unusably blurry.
But wait... after returning it to Amazon (which was quick, return shipping paid, and pain free!!) for another copy of the lens it is very sharp and I would consider it acceptable for any amateur as well as professionals on a budget(such as myself).
That being said, I should mention that there is a bit more chromatic aberration than I have seen from other lenses but it's acceptable and can be minimized with smart shooting.
CONCLUSION:
Don't be scared of the lens but do be sure you can return without hassle. All-in-all I am extremely happy with the results of the second lens.
Evaluation:
Conclusion: Great Lens, Great Price
Review: I bought this lens as a result of the damage of my other sigma lens(18-50mm). Basically it fell out of my camera bag. I was going to save up for the Canon L series version of this lens, but I was forced to buy a lens pronto... Fortunately I'd already done research on these lenses. The main drawbacks of this lens is the lack of USM, and the fact that the 82mm filter screw is larger than normal... But that's ok. I don't like filters anyway, and for the 800 dollar difference, quietness is not worth it. I went to canoga camera and tried both the L lens and the sigma... Back at home with my big cinematic monitor I couldn't tell the difference between the two lenses... I'm glad that I wrote down which exposures were which.
I've heard complaints about flair on this lens... I couldn't find it. with the provided lens hood attached, I took a few pictures directed at a bright glass door, the sun behind a model, and sun through the trees, and nothing... The glass on this is great, very low amount of aberation... only at extreme wide open aperture.
To review:
Sigma... No HSM, 82 mm, L quality image.
Canon... USM, 77mm, L quality image.
Evaluation:
Conclusion: My Walkaround Lens
Review: I use this lens as a walkround lens, it's a great lens with great IQ, Highly Recomended
Evaluation: 
Conclusion: Love it
Review: I use this lens to take action photos at my curling club. The f2.8 works wonders in the poor lighting of the arena.
Evaluation:
Conclusion: A great lens !
Review: Cristal clear at all f/stops including f/2.8 at 800 iso. Love every thing about this lens, the feel is topnotch, i like the heft and the solid feel, allso like the lens hood that Sigma supplys with this one.
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