Vivitar Series 1 — 70-210mm f/2.8-4 macro-focusing telephoto zoom, Kino Precision built
The Vivitar Series 1 70-210mm f/2.8-4 was a flagship telephoto zoom in Vivitar's premium Series 1 line, built under contract by Kino Precision with later Cosina-made and apochromatic versions, sold from the late 1970s as an alternative to camera-brand telephoto zooms.
It is a manual-focus, one-touch macro-focusing zoom with a variable maximum aperture of f/2.8 at 70mm narrowing to f/4 at 210mm, built to a noticeably more ambitious optical formula than Vivitar's standard telephoto zooms and produced across the major manual-focus SLR fittings of its era. Exact weight and filter thread vary by production run and are not confirmed here.
Its close-focusing macro mode and comparatively fast, near-constant-through-the-range aperture set it apart from Vivitar's budget zooms, delivering sharper, higher-contrast results that were reviewed favourably against contemporary first-party telephoto zooms.
Series 1 examples command a premium over ordinary Vivitar zooms on the used market. Check the macro-focus ring engages without play, confirm the sample matches the Kino Precision or Cosina/apochromatic version being sold, and inspect for haze on the many internal elements.