Sigma 17 50mm f 2.8 dc hsm os %28for nikon%29

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Sigma 17-50mm f/2.8 DC HSM OS for Nikon

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The Sigma 17-50mm f/2.8 DC HSM OS for Nikon

The Sigma 17-50mm f/2.8 EX DC OS HSM is a normal-range zoom lens designed specifically for DSLRs with an APS-C sensor. A fast f/2.8 maximum aperture makes it great for low-light event shooting, as well as on-the-go portraits. The lens features Sigma’s built-in four-stop OS to further aid low-light shooting. Sigma has minimized optical defects such as aberrations and ghosting/flaring by utilizing aspherical and low-dispersion elements, as well as their Super Multi-Layer coating. This makes for a highly versatile lens that’s been designed from the ground up for crop-frame shooters.

Roger's Take

There are several choices in the 17-50mm range for crop-sensor cameras, and rather than doing separate takes for each, I thought a bit of comparison would be better. The summary, though, is they are all pretty good. Whichever you choose will probably leave you satisfied. An important generalization first: all of the 17-50mm lenses are sharper at the wide end than at the long end. If you think you’ll be shooting mostly at 50mm or so, you might want to consider something in the neighborhood of 24-70mm.

Nikon 17-55 f/2.8: The most expensive of the bunch by a good margin. It doesn’t have vibration reduction. It autofocuses more quickly than the Tamron, which has a micro-motor rather than USM motor. It has less distortion (although it’s still significant at 2%). It’s built like a truck and would be my choice for war-zone photography. Otherwise, it’s really expensive compared to the others.

Sigma 17-50 HSM OS: As sharp as the Nikon in the center, and at f/4 is as sharp in the corners too. Maybe even sharper than the Nikon at f/4. It has more barrel distortion at the wide end at 2.9%. That is easy to correct in Photoshop, but correcting distortion also decreases resolution, particularly in the corners. Probably as good as the Nikon except for autofocus in low light.

Tamron 17-50 f/2.8 VC: This lens has excellent vibration control, as do the Sigma and Nikon. It’s not quite as sharp as either, although it’s in the same ballpark, and it is less expensive. It has even more barrel distortion than the Sigma, though, at 3.3% at the wide end. Has had some autofocus problems where only the center AF point is active on some Nikon cameras.

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