I just got a sigma DC 18-200mm f3.5-6.3 and it wont autofocus. Is the camera compatable with this lens? I must add that it is a used lense and it was put on a D7000 and it worked perfectly. Any ideas??
#1. "RE: D3100 lens issue" | In response to Reply # 0JosephK Nikonian since 17th Apr 2006Sat 24-Dec-11 10:57 PM
If it is the older version of the lens without the optical stabilization, it will not auto focus on the low-end Nikon DSLRs. The D7000 has an auto-focus motor in the camera that the lens requires. The D3x00, D5x00, D40, D60 cameras do not have the needed motor.
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D700, D200, D70S, 24-70mm f/2.8, VR 70-200mm f/2.8 II, 50mm f/1.4 D,
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#2. "RE: D3100 lens issue" | In response to Reply # 0MEMcD Nikonian since 24th Dec 2007Sun 25-Dec-11 07:06 PM
Welcome to Nikonians!
As stated above, the original version of the Sigma 18-200mm f/3.5-6.3 DC does not have an AF motor built into the lens. It has a screwdriver type AF drive that is driven by the AF motor in the camera body. D40, D40X, D60, D3000, D5000, D3100, and D5100 bodies do not have an AF motor built into the camera body. Therefore AF will not work. The current version of the Sigma 18-200mm has an HSM motor built into the lens.
Good Luck and Enjoy your Nikons!