Mamiya Sekor C 300mm f/5.6 - Mamiya M645-mount

The Mamiya Sekor C 300mm f/5.6 is a long telephoto lens for the M645 medium format system, offering an equivalent focal length of approximately 180mm. It is designed for subjects requiring significant reach, such as wildlife or distant landscapes. Despite its focal length, the lens remains relatively compact for a medium format optic and features a built-in retractable lens hood to manage stray light. When inspecting a used 300mm lens, the focus ring should be checked for smooth travel across the entire range, as longer barrels can sometimes suffer from uneven lubrication. SDS performs a thorough optical check for fungus and haze, particularly on the rear elements. The aperture diaphragm is tested for snappy operation, and the mount is inspected for any physical wear or damage.