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I use sigma lenses. These are highly comparible when you put them side by side with the nikkor lenses.
In fact sigma lenses will produce a much sharper image than the nikkor lens will. I have put the images taken by the same type lens but one is sigma, and the other nikkor and the sigma is so much sharper and crisper.
Don't get me wrong, i think nikkor lenses are good, but at the price they go for, i think it is a little bit high for my pocket book. In general sigma lenses are 50 to 65 percent cheaper.
I am a pro photographer, and i shoot with 2x Nikon D200 + Sigma 70-200 f/2.8 & Sigma 18-50 f/2.8 and a Nikkor 50mm f/1.8.
Hope this helps you decide in what to look for.
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