Vivitar's specifications were turned into a lens design by optical engineer Ellis Betensky of Stamford, CT. Betensky had developed an early auto-optimizing optical design program that he ran on a mainframe computer owned by Perkin Elmer. Betensky's design was then manufactured by Kino Precision.
From Wiki concerning the 70 to 210 macro S1
The Vivitar Series 1 70-210mm f/3.5 VMC Macro Focusing Zoom lens was designed for and marketed by Ponder & Best (later Vivitar) in the 1970s. It was the first Vivitar Series 1 lens and was considered revolutionary for its time. Among other innovations, it is notable as the first macro focusing zoom lens. Its patented ability to switch into macro mode was eventually adopted by nearly every major camera and lens manufacturer in the world.
Vivitar's specifications were turned into a lens design by optical engineer Ellis Betensky of Stamford, CT. Betensky had developed an early auto-optimizing optical design program that he ran on a mainframe computer owned by Perkin Elmer. Betensky's design was then manufactured by Kino Precision.
You can probably find out on line who made the 420/SL. Vivitar sold some very well-made cameras -- from Cosina, Seagull, and others.
I have a Vivitar V50 which, as far as I know is the only Vivitar 35mm SLR that was made with a Minolta Rokkor lens mount. It was made by Seagull, on the old Minolta X-370 production line, and is basically the exact same camera.
http://www.subclub.org/minchin/vivitar.htm
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A lighter camera is the Vivitar XC 3 a rebranded Cosina CSM, I had one for a few years, used along side of the larger and heavier Chinon CM3 or CE4, metering was really good. I think I would like the size of the 420. If it has been boxed for the past 50 or so years, are you going to have it CLA?
Ah, yes. Nice copy of the X-570 or is it the X-370? I wouldn't mind one of those at all.
The baseplate on mine says Mfg. by Cosina Japan.
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