One last thought... for review, this is a Super Angulon f8 #13274037 mounted in the latest version of a Copal 0, but with widest aperture at 5.6. And the Copal had a Rodenstock Quality Seal on it.
OK. I noticed the aperture scale has a series of minuscule digits: 0011.067. This may be a part number linking the Copal to it's original Rodenstock lens... whatever that was?
Bob, if that's the case and based on this number, have any idea what the originating Rodenstock lens this may have been. The 3 digit code for the 120mm Macro, 135mm and the 150mm Copal 0 5.6 variants are different.
Kumar: thanks for the excellent link and info, but the calculations and procedures are well beyond my meager mental capacities. I'm just a very old man with a brain hard-wired to art and little else at this point.
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