Techart TA-GA3 auto focus lens adapter for Contax G lens to Sony E mount adapter - NEX-7 A7 II A7R IV A9 A6000

The adapter is new, top of the line quality.
Suitable for all Sony E mount (former NEX) cameras and certain types of Contax G lenses, supports auto focus function with E mount cameras.
True electronic integration of aperture diaphragm - You can change the aperture on camera body (S/M mode) or let the camera choose aperture automatically (P/A mode).
Can change the aperture when taking movie (on NEX 5n or later model).
Show aperture, shutter speed and focus distance in EXIF.
Easy to use, do not need extra accessories, like external battery and etc.

Settings:
1. Put red marks of the adapter and lens collar together.
2. Turn the adapter anticlockwise till the fixative click.
3. Set Contax G lens.

Removing:
To remove the adapter you should turn the adapter clockwise.

Compatibility:
Suitable Lens:
Biogon 21mm f/2.8 (please note the rear lens flange has to be cut)
Biogon 28mm f/2.8
Planar 35mm f/2
Planar 45mm f/2
Sonnar 90mm f/2.8

Notes:
Always turn the aperture to full open before switching on camera.
You need to set aperture on camera manually. The real time aperture value cannot be displayed on screen. The camera body and the lens are not couple. The aperture shown on the camera body is just for reference and the EXIF data would not affect metering.
If camera flash is used, it is suggested to set the lens aperture and camera body aperture the same. Otherwise the flash output may not be correct.
It is also highly recommended to switch off the camera before you change the lens.

Please refer http://www.techart-logic.com for firmware update.