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G'day Robert,
Think for something like a camera lens, it'd be a bit tight getting 64mm in there. If you used a 50mm finderscope that has something like the hood that might be a few mm more than the 50mm, at least you can unscrew the hood to slide the finder in there no worries. I've done it.
I'll have to get back to you on the centres of the rings in the other direction.
And apologies to Mark above for not getting back about the hole spacings. Will measure that as well. Sorry, Mark.
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