This Metabones Nikon G to Sony E-Mount Speed Booster (META-033U, MB_SPNFG-E-BM2) let you use Nikon G (and F) lenses on Sony E-Mount camerabody's. The Speed Booster glass element will increase the field of view from your lens with 0.71x and increase the maximum aperture with one f/stop. With the aperture ring on the adaptor you are able to take over the aperture control of your Nikon G lens.

Tips: Before mounting your lens to the adaptor, please make sure that the f-stop of the aperture ring on the adaptor is turned to "7" (i.e. mounting your lens to the adaptor while only the aperture ring in the adaptor is full closed).

Like the revolutionary original Metabones Speed Booster announced in January 2013, the Speed Booster ULTRA has a magnification of 0.71x, and so it effectively reduces the crop factor of mirrorless cameras with DX-sized sensors, such as Sony E-mount and Fuji X-mount cameras, from 1.5x to 1.07x.  However, the new ULTRA design makes very effective use of exotic materials at the furthest limit of glassmaking technology, and as a result is well corrected for use with virtually all fullframe SLR lenses regardless of exit pupil distance. Thus, the Speed Booster ULTRA performs extremely well with professional-grade f/2.8 zoom lenses such as the 24-70mm f/2.8 and 70-200mm f/2.8 zooms by Canon and Nikon to produce 17-50mm f/2.0 and 50-142mm f/2.0 high-speed zooms, respectively.  Similarly, high-speed fixed focal length lenses such as a 50mm f/1.2 will be transformed into a 35.5mm f/0.9 lens with excellent contrast and resolution from the center all the way to the edges of the image. 

Features
• Increases field of view with 0.71x
• Increases MTF (Detail/Contrast)
• Increases maximum aperture with 1 f/stop
• Industry's best aperture ring covers a 8-stop range markings, clearly indicating actual number of f-stops. No more guesswork! (Patent pending).
• Both camera-side and lens-side of the adapter are made of brass, precision-machined and plated with chromium.
• Satin surface finish - just like your OEM lens and camera mounts.
• Precise fit and solid connection - lens has no play, gap or wiggling when mounted on adapter and no adjustments are required to fit your lens.
• Designed to reach infinity focus while maintaining the correct registration distance required to maintain optical quality of CRC lenses or lenses with floating elements.

Specifications
• Nikon G and F lens attachment
• Sony E-Mount camerabody attachment

List of incompatible lenses
Nikkor 2.1cm /f4.0
NIkkor 20 /f2.8 AI-s