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Thanks GreenWing for responding to my question.
I am looking for a walkabout lens for my Nikon D5000, and trying to find out what is the main different between Sigma 17-70mm and Sigma 24-70mm, both at f2.8, but the later one is £100 dearer
I am also using Sigma 10-20mm, and nikkor 55-200mm.
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