Made for the Zeiss Ikon, they cover the full 24x36mm 35mm frame and will also potentially fit most if not all Leicas, including the new M8; the M-mount Cosina Voigtlander cameras; the Hexar RF; the Epson RD-1; and other M-mount cameras. (Possible camera-lens matching restrictions due to issues such as protruding elements are unknown at this time.)Zeiss ZF Distagon T* 35mm ??/2Zeiss ZF Makro-Planar