- Industry's best aperture ring covers a 8-stop range 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).- Advanced 5-element/4-group optical design incorporating ultra-high index tanatalum-based optical glass by Caldwell Photographic in the USA (patent pending).- Increase maximum aperture by 1 stop.- Increase MTF.- Makes lens 0.71x wider.- The tripod foot is detachable and compatible with Arca Swiss, Markins, Photo Clam ball heads.
List of incompatible lenses:
Nikkor 2.1cm f4