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Background: I have a Nikkor 70-300 AF-S G. Somehow, the VR and AF systems stopped working.. It was working perfectly fine, then for 2-3 months it stayed inside the bag, in a wardrobe, without even touching it and the next time, I mounted it on my D7000, it just didn't work - no AF, no VR..

I sent it to service and it appeared, that the fix would cost me more, than buying a completely new copy of the lens..

So, as far as I know, the Nikkor 70-300 AF (note: without -S) works fine on bodies with internal motor, for example - with D7000.

That made me wonder why, in MF mode, the 70-300 AF-S does not work with the built-in motor, when the body's mode is AF?

And is there a way my "broken" 70-300 to start working with the internal body's motor?

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2 Answers 2

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If you are asking why AF-S lens with broken motor does not auto-focus on body with built-in motor then the answer is simple. AF-S lenses are not designed to be driven by in body motor - they simply lack screw necessary for that. They are always focused by internal motor on any Nikon body.

So unfortunately your lens may be used only with manual focus...

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  • \$\begingroup\$ You mean, that that little screw, near the DoF preview button, is the one, that controls the autofocus in AF and AF-D lens: static.borrowlenses.com/images/store/D7000_front_rgb.jpg ? And that AF-S lens does not use that screw, right? \$\endgroup\$
    – Kiril Kirov
    Sep 17, 2012 at 7:17
  • \$\begingroup\$ Ahaaa, I finally found it in the web. Thanks, I haven't noticed that before. I think it's not in my D7000's manual. \$\endgroup\$
    – Kiril Kirov
    Sep 17, 2012 at 7:21
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The AF-S lens uses an internal motor. Therefore it lacks the connection to the body's motor.

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  • \$\begingroup\$ Thanks, +1. I accepted the other answer, because it helped me understand the way, the body controls the AF/AF-D lens, as I didn't know what exactly does "connection" mean. \$\endgroup\$
    – Kiril Kirov
    Sep 17, 2012 at 7:22

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