What are the two pairs of grooves on AF-D lensbarrels?

Started Jan 9, 2013 | Questions thread
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overniteman Contributing Member • Posts: 860
Re: What are the two pairs of grooves on AF-D lensbarrels?
1

Those polycarbon lens barrels can be a little slippery.

I think they are for gripping and used to mount / unmount the lens from the body. Otherwise you'd have to use the locked aperture ring to twist them on  / off.

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