Blackmagic Design Blackmagic URSA Mini Pro B4 Mount (NOT compatible with URSA Mini Pro 12K)

To clear up any potential confusion, this is NOT Sony Alpha, but Alpa of Switzerland. You will most likely be using the Kern Macro Switar 50mm f/1.8 or f/1.9 apochromat lens on this adapter.

• • • • • 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.