Contax G mount lenses

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 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 focus motor in the camera, even in manual focus mode. Focusing is done by slotted “screwdriver” coupling, its autofocus system uses twin-window rangefinder mechanism, just like a traditional, mechanical rangefinder.

The mount has four tabs, 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. Hologon 16mm lens does not feature autofocus, and has 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 mount. 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


Last update: 13.12.2022.