Photography Asked by user87638 on April 16, 2021
I have a B+W Filter 77mm HTC Cirular Polarizer Nano KAESEMANN XS-Pro MRC. It has become so stiff to rotate that I basically can’t use it anymore. I’m assuming some dirt has gotten into the threads. How can I clean this properly, without damaging it?
I see three possibilities, not all of which might be DIY
In terms of delicacy vs price, that's right up there in the "I really ought to take it to a pro" stakes.
However, my money would be on…
It's no longer flat.
Test by placing it on a dead flat surface, maybe a mirror, & see if there's any movement/rocking/visible gap. If it's distorted you'd have to weigh professional intervention against how gently you might try to rectify that.
It's no longer circular.
You can try gently squeezing it from the edge, turning slightly each time to see if it frees up with pressure in one direction, but I doubt that's a DIY fix at all. Take it to a professional.
Answered by Tetsujin on April 16, 2021
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