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Rating: 
Summary: Incredible buy!
Review: Performance:
This lens couldn't be much sharper at 15mm, it is pristine. Softer at 30mm, though still better than average corner to corner. I like that it seems optimized for 15mm. Very impressive, Sigma. Some flare, but any 15mm zoom is really prone to that. f3.5 is a little slow, but at 15mm 1/15 sec works for handholding, so it isn't a problem. Incredibly deep DOF at 15mm, makes for spectacular foregrounds, sharp from your feet to the horizon (at least with a cropping DSLR). 8 blades is very respectable for a lens of this price and not much is usually OOF. Build:
Superior. Suprisingly light for it's size. Fast AF. The 82mm front thread is accomplished using a felt lined cap that slides firmly over the permanent pedal hood. A little awkward but it works a lot better than it sounds. No vignetting with an 82mm front filter using a cropping DSLR at 15mm, I doubt the same would be true with full frame where the angle of view is really uncanny. Overall:
Arguably the best in its class, great price makes it even better. Everytime I see the images I thank myself for buying this lens.
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