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I use 18-140 Nikkor . This lens have two A & M focus mode and this lens is AF-S that mean when auto focus is enable the focus ring dose't move. If i do manual focus when the lens is at A mode , does it harm the lens ? or its safe.

  • Related: Nikon D3300 autofocus issue – Michael C Jun 24 '18 at 7:23
  • @MichaelClark no my Q is deeper . And due to solved description this has better Professional value Michael. – Mister X Jun 26 '18 at 12:06
  • Can you post your edit as an answer please and accept it rather than modifying your question? – Crazy Dino Jun 26 '18 at 13:49
  • @CrazyDino Already done. – Mister X Jun 26 '18 at 14:51
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In general, you can damage your lens if you turn the focus ring while in autofocus mode. The exception is ring-type lens motors, which are often branded "ultrasonic" or similar. (Nikon uses "Silent Wave Motor", although it unhelpfully uses this designation for both ring and "micromotor" designes). There are also some Pentax lenses which have a clutch mechanism.

Assuming that this 18-140mm is your lens, note that it's explicitly listed as having "full-time manual focus override". This means that it either has a ring-type motor, or a clutch mechanism, so it should be safe.

  • In User-Guide it's explained well : A Mode : Auto focus (Manual Focus * ) available only when single-servo AF ( AF-S ) is selected as the camera focus mode ( So its safe when mode set to A and in settings focus mode set to AF-S ) so i've got my answer with Lens user-guide manual . – Mister X Jun 26 '18 at 12:01
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In User-Guide it's explained well : A Mode : Auto focus (Manual Focus * ) available only when single-servo AF ( AF-S ) is selected as the camera focus mode ( So its safe when mode set to A and in settings focus mode set to AF-S ) so i've got my answer with Lens user-guide manual .

  • that is not about safety (=whether it's good or bad for the mechanics), but about the fact that in non-single AF modes the camera will re-focus if you change it manually, so you'd be fighting against the motor. in single mode it focuses only once as long as you stay on half-press. – ths Jun 26 '18 at 14:51
  • @ths AF-S didn't lead me to fighting with motor . In AF-S lens will refocus in shutter relase. So by that way you can correct Auto Focus as you want . – Mister X Jun 26 '18 at 14:55

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