Minolta's legendary constant f/4 telephoto zoom — the 'Beercan' — a cult classic on Sony A-mount.
The Minolta AF 70-210mm f/4 — informally known as the 'beercan' for its uniform cylindrical body — was released in the mid-1980s as one of the first autofocus telephoto zooms for the Minolta A-mount system. It provides constant f/4 across the 70-210mm range — an unusual specification for consumer telephoto zooms of any era. Compatible with Sony Alpha A-mount bodies, which provide SteadyShot IBIS that the original Minolta bodies could not offer. At 695g and 55mm filter thread it is vintage telephoto standard.
The optical design uses 12 elements in 9 groups. Seven aperture blades. The 55mm filter thread is a vintage Minolta standard. At 695g the lens is moderate. Minimum focus distance of 1.1m. AF is driven by the camera body motor (screwdrive), requiring a body with an internal AF drive. Constant f/4 aperture throughout 70-210mm. No IS in the lens — Sony A-mount bodies with SteadyShot provide in-body stabilisation.
The constant f/4 was the beercan's defining specification for its era: most consumer telephoto zooms of the 1980s used variable aperture, making the f/4 constant formula a practical achievement at the time. On Sony A-mount bodies with SteadyShot IBIS, the lens gains stabilisation that its Minolta-era origins could not provide. The Sony A-mount ecosystem allows pairing with modern A-mount bodies for contemporary AF performance.
On the used market the Minolta AF 70-210mm f/4 is very affordable as a vintage Sony/Minolta A-mount telephoto. Condition checks: AF body motor engagement on a compatible body, zoom ring smoothness, aperture blades for oil contamination, and front element for marks. Compatible with all Sony Alpha A-mount bodies including SteadyShot IBIS models, and original Minolta Maxxum bodies.