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Michael Graves
30-Jan-2008, 12:20
After a couple of years of being AWOL, my digital calipers suddenly materialized in my desk drawer. My wife insists it was there all along, but I know better. The elves had it. Anyway, I zeroed it out and measured some of the oddball flanges that I have in a box and some of them don't cross-reference to anything I can find. Was hoping some of you might shed some light. Threads per inch are estimated.

2.68" hole, threaded appx. 25tpi.
3.08" hole, threaded appx. 30tpi
1.93" hole, threaded appx. 25tpi
1.48 30tpi

2.02" 30tpi

Ralph Barker
31-Jan-2008, 09:17
The lens board chart linked from the home page might be of some help:

http://www.largeformatphotography.info/lensboard_hole_sizes.html