Tamron 75-250mm f/3.8-4.5 (104A) - Tamron Adaptall-2 Mount

The Tamron 75-250mm f/3.8-4.5 (model 104A) is a manual focus telephoto zoom lens utilising the Adaptall-2 interchangeable mount system. It features a versatile focal range and a relatively fast constant-sized maximum aperture for its era. The lens is noted for its solid metal construction and 'push-pull' zoom mechanism, which also controls focus. It provides a useful reach for wildlife or sports photography on both film and adapted mirrorless cameras. When inspecting a used 104A, the primary concern is the smoothness of the push-pull action, as these can become loose or 'creep' over time. SDS checks the internal optics for haze and fungal growth, which are common in older zooms. The Adaptall-2 mount should be inspected for secure locking and correct aperture linkage engagement. External wear on the rubber grip and filter thread integrity are also verified.