This Speedbooster allows a full frame Nikon F-Mount G lens to be mounted to a Sony NEX format camera while increasing the angle of view and the maximum aperture one f/stop.

The Speed Booster takes the light from a larger full-frame lens' image area and projects it onto the APS-C sensor allowing the sensor to utilize all of the lens' light and effectively produce a full-frame angle of view with an APS-C sensor. This also increases the maximum aperture of one f/stop making the lens more effective in low-light and able to produce a shallower depth of field.

The Nikkor f/4 and 20mm f/2.8 AI-S lenses are not compatible with the speed booster.

Features:

• Industry's best aperture ring covers a 8-stop range with half-stop markings, clearly indicating actual number of f-stops. No more guesswork! (Patent pending).
• Compatible with both Nikkor G lens & F lens (include non-AI & AI lens mounts).
• Increase maximum aperture by 1 stop.
• Increase MTF.
• Makes lens 0.71x wider.
• Optics designed by Caldwell Photographic in the USA (patent pending).
• The tripod foot is detachable and compatible with Arca Swiss, Markins, Photo cam ball heads.

Speed Booster® is NOT compatible with full-frame camera bodies such as A7, A7R and NEX-VG900.

Tips: Before mounting your lens to the adaptor, please make sure that the f-stop of aperture ring on the adaptor is turned to "8" (i.e. mounting your lens to the adaptor while only the aperture ring in the adaptor is full closed.).

Remark: This mount is manual aperture control. It does NOT support electronic aperture control.

Disclaimer: Metabones are NOT licensed, approved or endorsed by Sony or Nikon

Why Metabones®?

Since its inception, Metabones® has been designing and manufacturing lens adapters recognized among professionals and enthusiasts as leaders in design and workmanship.

Contrary to the popular trend of other factories using an aluminum ring painted black on the camera-body-side, we instead take no short-cut but use precision-machined brass with chromium plating on both the camera-body and the lens sides of our adapters, in order to ensure smooth mounting, great appearance, and durability. The lens side of the adapter features a strong leaf-spring structure, strengthening the adapter-lens connection and ensuring tightness of the lens in order to reduce wear and prevent focus errors and optical alignment issues from appearing.

Metabones® uses matte-black treatment to keep internal reflection to a minimum in order to maintain the maximum optical quality possible with the lens.

Metabones® Contax Yashica Lens to Sony NEX Speed Booster follows this tradition of uncompromising precision, robust build quality and outstanding finish.

Features

• 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.