Tamron 80-250mm f/3.8-4.5 — first-generation Adaptall telephoto zoom (CZ-825), multi-mount fit
Tamron's 80-250mm f/3.8-4.5 telephoto zoom belongs to the original Adaptall mount system, sold as model CZ-825 from 1976 and updated as QZ-250M in 1978, before the Adaptall-2 revision replaced the range in 1979. It was one of Tamron's longer telephoto zoom options of the mid-1970s.
The lens uses first-generation Adaptall adapters, offered for Canon FD, Nikon F, Minolta MD, Olympus OM, Pentax K, Konica AR and the M42 screw mount that remained common on Praktica and some Pentax bodies through the decade. Maximum aperture varies from f/3.8 at 80mm to f/4.5 at the long end.
As a 1970s telephoto zoom, it favours reach over speed and handles more like the era's simpler push-pull zooms than Tamron's later CF Macro or SP-branded telephotos, without close-focusing or the refinements Tamron added to the range from 1979 onward.
Being an early Adaptall lens, condition varies more than Tamron's later Adaptall-2 zooms, and adapters from this generation are not compatible with later Adaptall-2 mounts. Inspect for fungus and haze in the long optical path, check the zoom action for stiffness, and confirm the adapter is the correct first-generation type.