Mark C wrote:
How old is the lens? There was a time when Sigma had a terrible reputation for making really shoddy lenses. The old joke that Sigma = Significant Malfunctions. I think it was with the advent of the EX series and later that they redeemed themselves.
I don't know real old sigma. When I got back into photography they had some "decent optical quality for the price" lenses. These days they seem to be doing some very top end work. Their 18-35/1.8 is groundbreaking, and supposedly very, very sharp. Their art series lenses have stellar reputations. My two biggest complaints about a lot of their new lenses is that they aren't available in Pentax mount, and I couldn't afford them if they were.
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