Just tried my 90 f6.8 Angulon and find opening about 3.3 mm larger than lens. Seems like there must be variation in '0' size mounts. The diameter of my threads is just over 32mm resulting in a bit of slop. Not being knowledgeable on these things I was wondering if this is common? As a manner of information the jam nut on my lens is labeled Burke & James and has a shoulder that is a bit too large for the opening on the 90 so I cannot just turn the jam nut around.
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