The Contax 645 AF mount is an electronic autofocus bayonet mount for the Contax 645 medium-format (6×4.5) SLR system, introduced in 1999. The focal flange distance is 64mm, the throat diameter is approximately 70mm and it has four tabs. It supports autofocus and electronic aperture control and was usable with both film and digital backs.
There is an adapter, the Leica S-Adapter C, that allows mounting Contax 645 AF lenses on Leica S camera bodies while retaining all lens functions – autofocus, aperture, and central shutter control. The Contax NAM-1 adapter allows using all Contax 645 AF lenses on Contax N camera bodies, including the Contax N Digital DSLR.
For adapting to Fujifilm GFX camera bodies, smart adapters with contacts and electronics are made by Fringer and Kipon – both with no optics and with 0.8× optics that reduce the crop factor to almost native 0.63×.
Compared to the usual 35mm format, the crop factor of Contax 645 AF-mount lenses is 0.62×.
Carl Zeiss lenses
All lenses have a built-in autofocus motor.
- Carl Zeiss Distagon T* 35mm F3.5 ~21mm-equivalent
- Carl Zeiss Distagon T* 45mm F2.8 28mm-equivalent
- Carl Zeiss Vario-Sonnar T* 45–90mm F4.5 ~28–55mm-equivalent
- Carl Zeiss Distagon T* 55mm F3.5 ~35mm-equivalent
- Carl Zeiss Planar T* 80mm F2 50mm-equivalent
- Carl Zeiss Apo-Makro-Planar T* 120mm F4 75mm-equivalent
- Carl Zeiss Sonnar T* 140mm F2.8 ~85mm-equivalent
- Carl Zeiss Sonnar T* 210mm F4 130mm-equivalent
- Carl Zeiss Tele-Apotessar T* 300mm F4 ~210mm-equivalent
References
- Contax 645 AF on Camera Wiki
- Leica S with Contax 645 lenses on Jip van Kuijk
- Contax NAM-1 645AF Lens to N-Mount Body Adapter on GearFocus
- New Lens Adapters for the Fujifilm GFX Include a Contax 645 AF Adapter on SLR Lounge
- KIPON Baveyes Contax 645-GFX AF 0.8x Adapter Review on Alik Griffin
Last update: 9. 7. 2026.