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Comments about Sigma 17-70mm f/2.8-4.5 DC Macro Pro Lens for Canon Digital SLR:
From day one after every picture I would get an Error 99 message in the display window on my Canon XTi. It would not allow me to take another shot until I cycled the power, or actually reinstalled the battery. Totally unacceptable behavior for a brand new out of the box lens! Sigma's Web Site had no information on this error and the camera never behaves this way with my Canon lens.
After searching on the Internet for "Sigma error 99" I found out this has been a common incompatibility with Canon cameras and Sigma lenses. I have now sent the lens to Sigma for repair under warranty.
I have never had to return a brand new product before for service and I am very disappointed in Sigma's apparent lack of thorough testing with this lens on Canon XTi. Their service department assures me this can be repaired and that this lens does work properly with a Canon XTi. Take some time to search on the error message yourself before you consider purchasing this lens.
From the little I was able to use the lens before sending it in for repair, I was very impressed with the picture quality, sharpness, easy manual and auto focus and the well built lens itself. My greatest fear is a long running back and forth with Sigma service, I do hope they fix the problem the first time!
Because of the Error 99 message, in spite of the other excellent qualities of the lens, I can not recommend this lens to anyone. I do not have the money or time to spend on products that need warranty work right out of the box.
Comments about Sigma 17-70mm f/2.8-4.5 DC Macro Pro Lens for Canon Digital SLR:
This was an upgrade for my Canon xti. What a difference. Crisp pictures, great colors. I use this as a walk around lens, but the macro feature is amazing. If you are on a budget, this is the lense to buy.
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Comments about Sigma 17-70mm f/2.8-4.5 DC Macro Pro Lens for Canon Digital SLR:
This is a great addition to my Canon 40D. Much, much better than the kit lens, and macro is certainly a bonus. Much lighter than I expected, yet solid feel on 40D. Size and weight is almost ideal for going all around and getting that great shot. Included petal hood is great.