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Good quality product, but unfortunately it do not fit to my Zenit M39 lenses and to the M42 Pentax-screw camera threads. It do go into some amount to both sides, but then it sticks there. Not going more, nor coming easily out. Maybe it has got the surface finishing into black after the thread has been ready so that the black surface finishing is blocking the threads. Or if the rise is 0.75mm and not 1.0mm like it should have been.
Verified purchase: Yes | Condition: New