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The Sigma 75-300mm f/4.5-5.6 is a manual focus telephoto zoom lens produced for Konica’s AR mount SLR system. Covering a focal range from 75mm to 300mm with a variable maximum aperture, it addresses a practical telephoto zoom range suited to wildlife, sports, portraiture, and general longer-reach photography. The variable maximum aperture runs from f/4.5 at the wide end to f/5.6 at full extension, and fully manual operation covers both focus and aperture adjustment directly on the lens. Sigma was a well-established third-party lens brand producing alternative optics across multiple mount systems during the film SLR era. Compatible with Konica AR-mount film SLR bodies, and adaptable to mirrorless and other camera systems via third-party Konica AR mount adapters.
– 75-300mm telephoto zoom focal range
– Variable f/4.5-5.6 maximum aperture
– Konica AR mount compatibility
– Fully manual focus and aperture control
– Third-party alternative optic from Sigma
– Compatible with Konica AR-mount film SLR bodies
– Adaptable to mirrorless systems via third-party AR-mount adapters
