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Photography Q&A
Screw drive motor
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<blockquote data-quote="BF Hammer" data-source="post: 787021" data-attributes="member: 48483"><p>Most screw-type autofocus lenses have the manual focus ring physically locked to the autofocus drive when AF is turned on. So you would be unable to turn the focus ring until the AF is turned off. There may be some expensive lenses that have a manual-override feature. But that is the only thing I have learned using screw-drive lenses.</p></blockquote><p></p>
[QUOTE="BF Hammer, post: 787021, member: 48483"] Most screw-type autofocus lenses have the manual focus ring physically locked to the autofocus drive when AF is turned on. So you would be unable to turn the focus ring until the AF is turned off. There may be some expensive lenses that have a manual-override feature. But that is the only thing I have learned using screw-drive lenses. [/QUOTE]
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