Tamron 90mm f/2.5 Adaptall-2 (52B/52BB) - Tamron Adaptall-2 Mount

The Tamron 90mm f/2.5 (model 52B/52BB) is a classic manual focus macro lens from the Adaptall-2 era, highly regarded for its sharpness and pleasing bokeh. It reaches a 1:2 reproduction ratio natively and can reach 1:1 with the dedicated extension tube. Using the Adaptall-2 system, it can be mounted to almost any SLR system or adapted to modern mirrorless cameras with the correct rings. Inspect the lens for 'oil on blades', which can cause the aperture to stick. SDS checks the manual focus helicoid for smooth, even dampening, as the grease can dry out over decades. We also look for internal dust and the common 'Tamron haze' on the rear elements. Ensure the Adaptall mount interface is clean and that the aperture linkage communicates correctly with the chosen camera adapter.