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

• 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.

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.