Vivitar Series 1 70-210mm 1:35 Macro focusing Zoom Lens, with caps
Optics: Excellent. No dust, no scratches.
Mechanics: Excellent. Uniform and smooth focus, smooth zoom with nice resistance. Aperture clean and fast.
Exterior: Excellent. Only slight signs of use on the mount. Otherwise like new
This is the Vivitar's Series One 70-210mm lens. Can be found in PK and PKA mounts (and M42 and other mounts). Made by Komine (28xxxxx serials).
This lens offers a relatively strong macro capability to 1:2.5 ratio at 210mm. There is an internal cam mechanism that automatically shifts you to 100mm focal length from 70mm when close focusing past 1.6m. Conversely, if focused closer than 1.6m the zoom is stopped at 100mm. At M-R on the distance scale you are at the CFD and max macro ratio is achieved at 210mm, no change in focus.