“Lens, D50 vs D3100 I have a Tamron 28-300 lens that I used successfully with my old D50. Yesterday I got a D3100 and the lens will not autofocus on the D3100. Is this because the D50 has an autofocus motor built in the camera body and the D3100 does not?”
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Nikon offers two types of autofocus digital camera bodies: those with a built-in focus drive motor and those which require a lens to have a motor. Cameras such as the D3100 do not have a focus motor in it so they require the lens to have the focusing motor – an “AF-S” lens. The D50 has the AF motor built-in.
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