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DSLR focusing micro rings ?

Guest peepshow

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Guest peepshow

I have seen pictures of fine focusing rings for DSLR.  One ring is mounted on the main body of the camera with 3 screws and the other ring on the moving focusing part of the camera.


Between these 2 rings are fine adjusting screws which move the rings back and forth for fine focusing and then they can be locked in position.


I have googled but cannot now find any reference to them...........partly because I do not know their correct name or who makes them.


Can anyone shed some light on them and where one can buy them, please?

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