Kaiser Fototechnik 6516 Filter adapter ring, black 52mm-55mm

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 1¹/₃ stop. (with a maximum output aperture of f/0.80)
      • Increase MTF.
      • Makes lens 0.64x 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.

• • • • • 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.