Has anyone seen a Vivitar branded LF lens before? Going by the serial number this is a prototype, but 180mm seems an odd focal length to start with so I wondered whether there where any others out there. I was also surprised to find out that Vivitar wasn't a manufacturer either, instead sourcing from a host of other companies. Schneider was one of those (they did a lot of contract work for other companies) but if it is the finish looks more like something from the twenties or thirties than the seventies. The cells aren't big enough to be a plasmat but I guess it could be a tessar that has been reduced slightly to fit the Copal 1 and thus has a f5.6 max aperture rather than the f4.5 you would expect.
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