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Sigma 17-70mm F2.8-4 DC Macro OS HSM

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Review Date: Oct 1, 2010 Recommend? yes | Price paid: $300.00 | Rating: 9 

 
Pros: 17mm wide end, f/2.8 at wide end, zoom lock, fast and quiet AF
Cons:
Decent in low light

This is a great lens to cover a good range of focal lengths. The 17mm is wide enough when needed - even on my crop 50D - and can be quickly zoomed to 50mm or even 70mm for that extra reach. It's a great multi-purpose lens that I've left on my camera a lot of times.

The f/2.8 aperture is decent in low light but limited only to the 17mm end, as it quickly goes beyond f/3 the second you start to zoom. I find myself switching for my Canon 50mm f/1.4 for indoor, low-light situations. But f/2.8-4.5 is still better than the f/4-5.6 of most kit lenses!

Zoom lock is a nice feature but even without it I don't notice any zoom creep. Good quality build with a nice feel and texture to the barrell, and smooth but tight focus/zoom rings.