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Sigma 28-70mm f2.8-4 High Speed Zoom

28_70_1_
Review Date: Feb 9, 2009 Recommend? yes | Price paid: $89.99 | Rating: 8 

 
Pros: Cheap Price Point, Good Focal Range, Small Filter Size
Cons:
Plastic Feel, the lens hood when reversed blocks all functionality, Soft 2.8

Purchased for a Nikon D90, I originally purchased this lens as a walking around lens since I didn't have a mid-range zoom lens. I was a little disappointed by the sharpness of the images at lower apertures. So it sat in my bag for a while.

Then I started shooting more close-up and macro work so I bought a BR-2a (reversing ring). I then bought a 58mm-52mm step down ring and mounted this lens reversed. Suddenly this lens found a purpose. Reversed the zoom range acts as a focus. Detail is sharp with the Aperture wide open a F22. So this is now my main close up reverse lens. And my recommendation is based on this use.

If using this normally, my suggestion is to test it out in all sorts of conditions first to determine the lens's limitations. It's a decent hobbyist lens but does not have the sharpness of a lens in the higher price range.