TECHART Contax G to Nikon Z Autofocus Adapters (TZG-01)


In-stock. Ship via Fedex International service. 

– Make Contax G lenses autofocus on Nikon Z cameras.
– Upgraded CPU and brushless motor for rapid autofocus experience
– Support AF-S, AF-C and MF
– Support Face and Eye detection
– Support Camera IBIS
– Firmware upgradable via the USB update hub
– Suitable to use in Nikon Z6, Z7, Z5, Z50, Z6 (ii), Z7 (ii), Zfc


1) Contax G lenses are mostly old on the market with different conditions. There is a chance that the lens gets worn being driven by the powerful TZG-01 motor. Use the adapter with consideration of this point.
2) Due to the focusing mechanism difference, the AF speed of this setup is still much different from using native Z-mount lenses.

*1 year warranty provided.  NO warranty service will be provided for any purchase via eBay/Amazon stores.




Continuing the success of TA-GA3 for Contax G lenses – Sony E cameras autofocus adapters, Techart has publish TZG-01 the autofocus adapter for the legendary G lenses focus automatically on Nikon Z cameras. The adapter motor drives screw on G lenses to initiate the focusing mechanism. AF-S, AF-C are supported as shooting mode, as well as manual focus.

Background of Contax G lenses

Contax G series were prime lenses launched in 1994, supporting their G1 and G2 rangefinder cameras. Each of the lenses are light and portable with classic optical designs and autofocus functions. Now, Nikon users can enjoy the unique shooting experience of Contax G lens painlessly.

Compatible Lenses List

  • Carl Zeiss T* Biogon 21mm/f2.8
  • Carl Zeiss T* Biogon 28mm/f2.8
  • Carl Zeiss T* Planar 35mm/f2
  • Carl Zeiss T* Planar 45mm/f2
  • Carl Zeiss T* Sonnar 90mm/f2.8
  • Carl Zeiss T* Vario Sonnar 35-70mm/f3.5-5.6

Finest Built Quality

Making of aircraft-graded aluminium and copper alloy, the ring is made light but tough, achieving best balance among weight, mechanical behaviour, and precision. Internal flocking is applied to eliminate any possible reflection of lights. The lens release tab has been approximated to the one on Nikon camera with less than 0.01mm tolerance to ensure a smooth installation of the lenses. The CPU has been upgraded to a 32-bit ARM unit while data transmission process and thus focusing performance has been fastened.

Compatibility with IBIS

While shooting, the aperture value in the camera should be set into dedicated values with respect to the focal length of the lens, to maximize IBIS performance. Contax-G lenses are manual aperture lenses that the setting of camera aperture will not affect the shooting exposure. Respective aperture values to different focal lengths are shown in the table below:

F1.0 F1.1 F1.2 F1.4 F1.6 F1.8 F2.0 F2.2 F2.5 F2.8
90mm 70mm 60mm 50mm 45mm 35mm 28mm 21mm 16mm 15mm

Product Features

  • Support AF-S and AF-S mode including face, eye, and animal detection
  • Support dynamic area AF, auto-area AF and single-point AF
  • Support burst mode, timer, and remote shooting
  • A release button on the side
  • A dial on the side of the adapter for manual focusing
  • Firmware upgradeable via Micro USB plug
  • Powered by camera body
  • Weight: 119g


  1. When adapting the Contax G lenses, most of the functions in the menu can be used, including AF-S\AF-C\MF focus mode, and AF-C in video-shooting mode.
  2. Under certain conditions, if the lens gets difficult to focus, users may change the focus mode to center point AF.
  3. In video shooting, wide-area AF and dynamic-area AF are most preferred.
  4. The focusing performance will be the best when aperture of the lens is in its widest amount. Users are suggested to focus with the widest aperture and adjust to a suitable aperture value after.
  5. TZG-01 does not support pinpoint AF.
  6. Camera has to be turned OFF before performing any lenses switch or the adapter may become brick.


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