... Great item at a great price. Much better price than a Nikon lens would cost. For anyone who is not a highly paid professional, why would you spend the $$ for a Nikon lens? This item is great and performs without issue. Sigma is a great brand. ...
Check Amazon Price and Read More Reviews on Sigma 17-70mm f/2.8-4.5 DC IF Macro Lens for Canon Digital SLR Cameras
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I own this model, and use it as a walkabout lens. I bought it because my previous walkabout lens, which was 28mm at the wide end, often made me wish I had something wider on the camera, and it didn't let in much light. This lens solved both of those problems. With 2.8 at the wide end, it's fast enough in that respect. And although I wish it had a constant aperture of 2.8, 4.5 at the long end hasn't proven to be a great disadvantage, so far (I've owned the lens for four months now). It's true that focusing isn't completely silent, or even nearly silent, but it's not really that noisy either - it's not the noisiest lens in my collection. Might be a consideration if you want to take candids, but since I don't often do that, I haven't found this to be a problem at all. Overall a very nice lens, useful for many purposes. Just don't try action shots - this lens had trouble focusing on a dog that was running very fast. That was more than it could handle. You might want to look at a lens with HSM or USM for that.
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