The Tokina 100-300mm f/5.6-6.7 was a slow, affordable manual focus telephoto zoom from Tokina's late-1970s to 1980s lineup, aimed at amateur photographers wanting extra telephoto reach for wildlife and sport without the cost of a faster lens.
It uses a push-pull one-touch zoom-and-focus barrel with a manual click-stop aperture ring, typical of the era's budget long zooms. The variable maximum aperture of f/5.6 at 100mm falling to f/6.7 at 300mm limits low-light use and demands a steady hand or tripod.
Image quality is soft toward 300mm wide open and contrast is modest in flat light, consistent with slow consumer telephoto zooms of the period rather than the company's faster AT-X optics. Stopping down to f/11 sharpens results noticeably.
These sell cheaply across most manual SLR mounts. Buyers should check the zoom barrel for wobble at full extension, confirm the tripod collar, where fitted, is present and undamaged, and inspect the rear group for haze common in long-stored telephoto zooms.