I understand the Schneider-Kreuznach Doppel Anastigmat Symmar f:6.8 is a Dagor copy with 80 degree angle of view. I have three of these:
1) F = 12cm with serial number that dates it to 1937, in a rim-set Compur shutter,
2) F = 24cm with serial number that dates it to 1942, in an Ilex No 4 acme synchro shutter,
3) F = 27cm with serial number that dates it to 1928, in dial-set Compur shutter,
How long was this lens series produced before the introduction of the "modern" Symmar.
I don't see many examples available on Ebay. Are they rare?
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