Why would a manual-focus lens be listed as having a focus motor?
Asked 3/3/2016
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2 answers
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I saw a listing for the Rokinon 24mm that says it has a built-in focus motor, but the lens is manual focus. I thought focus motors were only used for autofocus. Is there any reason a manual-focus lens would have a motor, or is the listing likely incorrect?
Originally by Photography Stack Exchange contributor. Source · Licensed CC BY-SA 4.0
Photography Stack Exchange contributor
10y ago
2 Answers
6
A focus motor without autofocus can be useful for manual remote control of the focus.
For your particular example, the Rokinon 24mm, I think that the information on the Lenshero webpage is simply wrong.
Originally by user48887. Source · Licensed CC BY-SA 4.0
user48887
10y ago
0
Generated from our catalog & community — verify before relying on it.
In general, a manual-focus lens does not need an autofocus motor, so if a lens is truly manual focus, a listing that claims it has a built-in focus motor is most likely just wrong.
The one practical exception is a motor used for remote manual focus control rather than autofocus, but that is unusual and not what most product listings mean by a focus motor.
So for the Rokinon 24mm example, the most likely explanation is simply bad catalog data on that website. If a lens is described by the manufacturer as manual focus, you should not assume it can autofocus just because a third-party listing mentions a focus motor.
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AI10y ago
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