I looked up threads here and searched in Google, but no answer is obtained so far for the title question.
I’ve recently got a copal 3 sample of Goerz Optical Co. INC Trigor 14” f11.
The scale shows f11 at minimum but the aperture blades goes wider up to the limit of the lens elements,
so I suppose it’s the same f8 as the gold dot dagor 14” f8.
My sample came with the original box, dating the inspection 7/20/1970 by an inspector initialed by R.
I don’t have a sample made in Switzerland by Kern, but from what I check from inages on internet, I observe the same barrel design with matt finish, the end finish being larger, inferring the Kern design.
I also have an AM Goerz Gold dot whose barrel is with glaze and the engravings on the front element barrel is indented and painted along the letters. There is no large end finish on the barrels for the AM gold dot.
The trigor sample here has no indent on the barrel, simple letterings painted.
The box and the sheet show Goerz Optical Co. INC subsidiary of Kollmorgen.
I wonder during the Kollmorgen period, Goerz Optical Co. INC contracted with Kern to make trigor and gold dot dagor lenses, before Schneider bought Goerz Optical Co. INC.
The original Goerz lens cap is embossed GERMANY on the side, CP Goerz New York on the top.
If anyone has some insights about this topic, I’d like to know.
Thanks in advance for your reply.
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