Tamron's classic Adaptall-2 telephoto — interchangeable mount system with 80-210mm zoom.
The Tamron Adaptall-2 80-210mm f/3.8-4 is a manual-focus telephoto zoom using Tamron's Adaptall-2 interchangeable mount system. The Adaptall-2 system allows the same optical unit to accept different brand-specific adapter rings for Nikon F, Canon FD, and other mounts. Variable aperture f/3.8-4. Manual focus.
Variable aperture f/3.8 to f/4. 58mm filter thread. Manual focus. Adaptall-2 interchangeable mount system (mount adapter sold separately per brand). Approximately 540g. Full-frame compatible. Mount depends on adapter attached.
The Adaptall-2 system is Tamron's key feature: rather than producing separate lens versions for each camera mount, Tamron produced a universal optical unit with a bayonet ring that accepts brand-specific adapters. This means the same 80-210mm optical unit can be adapted for Nikon F, Canon FD, Minolta SR, and other mounts by swapping the Adaptall-2 ring. The optical unit is identical across mounts.
On the used market the Tamron Adaptall-2 80-210mm is affordable as a vintage multi-mount manual-focus telephoto zoom. Condition checks: focus helicoid smoothness, zoom ring smoothness, 58mm front element for marks, Adaptall-2 mount ring mechanism. Confirm which Adaptall-2 mount adapter is included.