On a bit of an impulse I picked up a Caltar HR 90mm f8 (which is a rebadged Rodenstock Geronar WA) from eBay hoping to get a lens that would be a little more friendly to work with on my Super Graphic than my current Super Angulon - I figured if I didn't care for the lens I'd at least end up with a functioning spare Copal 1. It's a odd little lens - it's in a Copal 1 but the rear element flares out to the diameter of a Copal 3 board - so that's going to take some consideration to make work but not the end of the world. What I'm currently trying to figure out is how the rear element is supposed to come off. It seems to be quite stuck in the shutter - no amount of torquing by hand has freed it up. Before I go destroying something trying to get it off, is there a known trick other than brute force to get this thing unstuck?
Cheers,
Lee
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