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There may be a tiny amount of skin oil from your hands on the parts and/or the straps. Clean them with an alcohol wipe and try again.
Waikoloa, HI 96738
My strap wrenches are rubber also. This is really stuck.
I always carry a pair of strap wrenches with rubberized straps.
I mostly use them to unstick other people's stuff but every once in a while I
have to use them on my gear too.
The wrenches with cloth straps don't work well on smooth-finished
have an AP Field Flattener for my 155 and the threads are too tight to twist
off. I have the adapter for a DSLR stuck on the front. I would
normally not need to take it apart but I can hear the elements move inside and
wanted to see if I could tighten them.
First, any suggestions for getting the threads loose? I have some
strap wrenches and they don't work.
Second, If I can eventually get the front adapter off, can I easily tighten
the lens elements or should I send it back to AP?