Industry’s best aperture ring covers a 8-stop range, clearly indicating actual number of f-stops. No more guesswork! (Patent pending).

Compatible to both Nikkor G lens &  F lens (include non-AI & AI lens mounts).

Increase maximum aperture by 1 ²/₃stop. (with a maximum output aperture of f/0.74)

Increase MTF.

Makes lens 0.58x wider.

Click-less manual G aperture ring.

Optics designed by Caldwell Photographic in the USA (patent pending).

The tripod foot is detachable and compatible with Arca Swiss, Markins, Photo Clam ball heads.