Sigma 70mm f2.8 macro

Started May 4, 2007 | Discussions thread
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David59 Junior Member • Posts: 41
Sigma 70mm f2.8 macro

I am considering purchasing this lens. What is the process for changing from auto-focus to manual, is it a swich, clutch mechanism etc? Also I believe I have read that the manual focus ring rotates when af is engaged. Can anyone confirm.

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