The Tokina RMC 50-200mm f/3.5-4.5 was a manual focus macro zoom from Tokina's RMC line, sold from the late 1970s into the 1980s. It offered a portrait-to-telephoto range with close-focusing ability, popular as a second lens alongside a standard prime.
The one-touch barrel combines zoom and focus with a macro mode engaged beyond minimum normal focus distance, plus a manual click-stop aperture ring. Maximum aperture runs from f/3.5 at 50mm to f/4.5 at 200mm, with Tokina's RMC multi-coating applied throughout.
Sharpness is good in the middle of the range and softens at 200mm wide open, while the macro mode is useful for casual close-ups rather than critical work. It behaves as a flexible, general-purpose telephoto zoom with a genuine practical bonus feature.
These appear regularly in M42, Pentax K, Canon FD, Nikon F, Minolta MD, Olympus OM and Konica AR mounts. Buyers should test the macro-mode collar lock and one-touch zoom action for stiffness, and check the aperture blades move cleanly without oil residue.