Contax G mount was introduced in 1994. It is an electronic, autofocus mount made for 35mm-format rangefinder lenses. There is an electronic connection between the lens and camera to transmit data, but lenses have no AF motor and no means to adjust focus, focusing a lens is made by driving the focus motor in the camera, even in manual focus mode. Focusing is done by slotted “screwdriver” coupling, its autofocus system uses a twin-window rangefinder mechanism, just like a traditional, mechanical rangefinder.
The mount has four tabs and uses a breech-lock mechanism. Its focal flange distance is 28.95mm, its throat diameter is 44mm; it is used on two cameras and seven Carl Zeiss-branded lenses. Vario-Sonnar lens was the first zoom lens for a rangefinder camera, at the time of introduction, in 2000. The only lens that does not feature autofocus is Hologon 16mm lens; it has a fixed ƒ/8 aperture.
The Contax G lens system was officially discontinued by Kyocera in 2005.
Carl Zeiss T∗ lenses
Lenses are made by Carl Zeiss and have no distinctive mount designation in their name.
- Carl Zeiss Hologon 16mm F8 T∗
- Carl Zeiss Biogon 21mm F2.8 T∗
- Carl Zeiss Biogon 28mm F2.8 T∗
- Carl Zeiss Planar 35mm F2 T∗
- Carl Zeiss Vario-Sonnar 35–70mm F3.5–5.6 T∗
- Carl Zeiss Planar 45mm F2 T∗ 🔗
- Carl Zeiss Sonnar 90mm F2.8 T∗
Zörk Heliar lenses
Zörk Heliar lenses are factory-modified M-mount Voigtländer Heliar ultra-wide lenses done by Zörk Film & Photoelectric from Munich, Germany. Lenses are true conversions, with newly machined mounts. Lenses are manual-focus only and retain full TTL metering and focus indicator in the viewfinder.
- Voigtländer Ultra Wide-Heliar 12mm F5.6 Aspherical
- Voigtländer Super Wide-Heliar 15mm F4.5 Aspherical
- Contax G Price & Information Guide on AntiqueCameras.net
- Contax G on Wikipedia
- Contax G on Camerapedia
- Contax G System by Ken Rockwell
Last update: 13. 12. 2022.