Value of a vivitar zoom lens 503 50 21396/18/2023 For Pentax users, this version was available at first only in M42 screwmount trim, but a K-mount fitting was added to the available mounts when Pentax came out with K-mount bodies and lenses in 1975. The first VS1 lens design that Vivitar released, it probably did more than any other VS1 product to make the Series 1 lenses a highly respected line of lenses for quite some time in the latter 20th Century. This revolutionary lens design (the first successful "macro zoom" lens ever designed) was an f/3.5 model that likely underwent the greatest number of engineering revisions during its lifetime. The first VS1 70-210 zoom was manufactured by Kino (SN 22nnnnnn), from about 1973 to 1981. Interestingly, Vivitar was never actually a lens manufacturer per se - Vivitar contracted with various lens makers to produce lenses to its own specifications, which it then marketed under the Vivitar brand (although the contractors would sometimes end up releasing similar lens designs under their own and/or other brands), and this always-a-lens-specifier-and-never-a-lens-maker characteristic is certainly true for all the VS1 70-210 zooms. There are six versions of the manual focus Vivitar Series 1 (VS1) 70-210 zoom lenses, all of which can be distinguished apart from each other visually (and their manufacturers can be identified by using their serial numbers).
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