Had this lens for a while, decided to mount it onto a Sinar lens board. eBay purchase, appears to have been used in a industrial or military application as the lens came with an unusual collar and mount with a long tube extension. That part got cut down to a 0.90" collar to raise the flange of the Xenar high enough to clear the aperture pin on the Sinar shutter. Once that was done, the process of cutting a 4.402" hole in the Sinar board. This began with setting up the Sinar board in the lathe with a four jaw chuck, small boring bar.
Hole roughed out.
Finish bore the hole to 4.402" with a BIG solid carbide insert boring bar.
Bernice
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