SLT-AXX, A-mount lenses Sony DT55-200SAM or Sigma 70-300 DG APO

Started May 3, 2012 | Discussions thread
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jayboydog OP New Member • Posts: 8
Re: SLT-AXX, A-mount lenses Sony DT55-200SAM or Sigma 70-300 DG APO

trying to understand which lens has internal focus motor. when looking at the mount side of the lens, if there's a slot for mechanical rotating pin control from camera then the lens doesn't have a built-in AF motor. (only see the metal contacts for electronic communication with camera body). designations like USD or PZD or AF specify type of internal motor on lens. Internal focusing (IF) means non-rotating front filter ring (polarizing and graduated filters) and the lens length does not change during focusing.

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