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Old Dec 2, 2012, 4:30 PM   #1
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Default Sigma 17-50 2.8 OS Or Sigma 17-70 2.8 OS

Interested in these lens..Anyone comment on both..I see the 17-70 2.8 OS for Nikon is a tad cheaper..Always looking for the best bang for my buck...Thanks
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Old Dec 17, 2012, 4:42 AM   #2
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The "Sigma 17-70 2.8 OS" is actually the Sigma 17-70/2.8-4. It's a variable aperture zoom lens, having a maximum apertrue of f/2.8 at 17mm, but f/4.0 at 50-70mm. The 17-70 has less CA, but where their ranges overlap, the 17-50 is sharper. Also, the 17-70 has a magnification ratio of 1:2.7, while the 17-50 only goes to 1:5.

On the face of it, they seem to be very similar lenses, but the devil is in the details.

BTW, This is the Sigma dSLR forum. Do you have a Sigma dSLR or a Nikon dSLR?
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