Sigma's Zoom Lambda-II 75-300mm f/4.5-5.6 was a long-reach manual-focus telephoto zoom from the 1980s, giving film SLR owners an affordable route into wildlife and sports-length focal lengths without a specialist supertelephoto.
The lens covers 75-300mm with a maximum aperture narrowing from f/4.5 to f/5.6, manually focused with a manual zoom ring. Sigma produced the Lambda-II formula for Canon FD, Nikon F, Pentax K, Minolta MD, Olympus OM, M42, Konica AR and Contax/Yashica mounts, with multi-coated optics and a mostly metal barrel.
Reach at 300mm comes with the trade-offs typical of budget long zooms of the period: a dim finder image at maximum aperture, softness toward the long end, and a tripod collar was not standard, so handholding at 300mm demands fast film or bright light.
Available cheaply across most mounts today. Check for internal haze, a common issue in long-stored telephoto zooms, confirm the front element and coatings are free of deep scratches, and test that the zoom ring moves smoothly without creep at full extension.