Telephoto prime lens for the Contax 645 medium format system.
The Carl Zeiss Sonnar T* 210mm f/4 is a telephoto prime for the Contax 645 medium format autofocus system — a completely different camera system from the C/Y Contax 35mm SLR range. The Contax 645 (1999) was a 6×4.5cm autofocus medium format system using its own dedicated bayonet mount.
210mm focal length (approximately 132mm full-frame equivalent on 6×4.5cm), f/4 maximum aperture, Carl Zeiss T* coating, Contax 645 autofocus bayonet mount, medium format 6×4.5cm coverage.
The Contax 645 Sonnar 210mm f/4 provides significant telephoto reach for the 6×4.5cm medium format system with Zeiss T* optical quality. The Contax 645 system is distinct from the 35mm C/Y system — these lenses use a completely different mount. A sought-after medium format telephoto lens for the Contax 645 system.
Confirm compatibility with the Contax 645 body specifically — this is the Contax 645 AF mount, not the C/Y 35mm mount. Test autofocus function on a Contax 645 body. Inspect elements for fungus, haze, and T* coating condition. Check aperture blades.