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.

• • • • Canon EF mount lens to Blackmagic Design cameras with M43 mount, specific for BMPCC4K.
      • Increase maximum aperture by 1-stop. (with a maximum output aperture of f/0.9).
      • Increase MTF.
      • Makes lens 0.71x wider.
      • Patented 6-element/4-group optical design by Caldwell Photographic in the USA.

• Canon EF mount lens to Blackmagic Design cameras with M43 mount, specific for BMPCC4K.
• Increase maximum aperture by 1-stop. (with a maximum output aperture of f/0.9).
• Increase MTF.
• Makes lens 0.71x wider.
• Patented 6-element/4-group optical design by Caldwell Photographic in the USA.