Question on the type of Voigtlander lens I have. When I purchased I thought it was a 17 ½” F-6. When mounted and focus at infinity it seems the length is 19/20” measured from rear lens to film plane. If measured from the waterhouse stop slop it would be longer. I shot it at F-6 twice and both were overexposed by about 2 stops.
The photos attached - show #5 -- #23302 (1863) - Voigtlander & Sohn –
Wien – Braunscohneig.
Any help would great. The only catalog I have been able to find is from 1890. Plus, all the info I read in very confusing.
Jack
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