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Old 01-13-2013   #5
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hamradio is offline
Join Date: Nov 2008
Location: duluth, minn.
Posts: 408
I'm getting a mount diameter of 77.80mm on a 100/3.5 collapsible and a caliper that is +/- about .02mm.

I do not know the register distance, nor exactly how I'd go about measuring it on the breech-lock system on my super-23 and accounting for the film plane being recessed a few mm in the back.

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