- 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: we are NOT licensed, approved or endorsed by Sony or Nikon