I just found a very nice Commercial Ektar Lens, 8.5" f/6.3, set into the standard Ilex Acme #3 Shutter. I've drilled lens boards before, mostly for Copals, etc., and I found the specs on the lens. It calls for a hole size of 1.985" (50.42mm). I have hole saws of 1.875" and 2". However, I would have future use for a 50mm hole saw, and McMaster Carr has these. I already have a jig set up on my drill press to do lens boards, so I'm curious if the 50mm hole saw would be the best bet, or 1.875" and open up the hole a bit with a drum sanding bit.
Thanks.
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