... I am a amateur photographer, but was encountering situations where I needed a lens of this focal length which could accommodate less available light. My Canon kit lens only goes down to f5.6, and I had heard it was in general a poor quality lens. Well if it is, that makes this Sigma lens nothing but junk.
After receiving the lens, I noticed most pictures were very soft, almost out of focus. So a ran a number of controlled tests against my Canon kit lens, using both Auto focus and Manual focus with the Sigma lens (on a tripod, of course). In all cases, the Canon lens produced MUCH sharper pictures. How could this be, I asked myself.
So I sent the pics and an explanation, along with the lens, to Sigma for repair / adjustment. Two weeks later they returned the lens indicating they had adjusted the AF, and tested the lens, and all was now OK.
I beg to differ. I ran more tests, and guess what! The Canon lens wins again. Needless to say, if you want sharp pictures, forget this lens. You'll probably pay twice as much for the similar Canon lens, but you'll probably get pictures twice as nice. ...
Check Amazon Price and Read More Reviews on Sigma 28-70mm f/2.8 EX DG IF Aspherical Lens for Canon SLR Cameras
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