mount. 28 mm f/4 35 mm f/2.8 35 mm f/4 Curtagon 28 mm f/4 Retina 28 mm f/4 (made for the German Kodak camera, the lens only incorporates the front optical block, the aperture ring does not function until the lens is attached to the camera which also incorporates the rear optical block) 35 mm f/2.8 Electric 35 mm f/2.8 Edixa 35 mm f2.8 (M42 mount, similar in appearance and design to the standard Curtagon 35mm f2.8 for Exakta with knurled Zebra focus ring) Edixa 35 mm f2.8 (Edixa bayonet mount, Zebra non-knurled focus ring with 'Schneider Kreuznach - Edixa Curtagon' lettering on front of the lens but placed outside the filter ring) Edixa 35 mm f2.8 (Edixa bayonet mount, a completely different external design in all silver compared to the previous 2 Edixa-Curtagon designs) Retina 35 mm f/2.8 (a complete lens with focusing ring and aperture control with the DKL Deckel mount) Retina 35 mm f2.8 (made for the German Kodak camera, the lens only incorporates the front optical block, the aperture ring does not function until the lens is attached to the camera which also incorporates the rear optical block) Alpa 35 mm f2.8 35 mm f2.8, for Rollei SL 35 and SL 350 QBM mount (rare) 35 mm f/4.0 PA-Curtagon A perspective-control lens of 7 elements in 6 groups for 35mm cameras, which allows shifting of up to 7 mm, in an axis defined by a separate rotating ring on the lens. The PA-Curtagon is available in Praktica (M42), Exakta, Alpa-Reflex, Leica R, Minolta, Miranda, Canon, Nikon, Contarex, and Olympus OM mounts. It was also available for Rollei QBM mount under the name PC-Curtagon. 35 mm f/4 Curtar-Xenon Retina-Curtar-Xenon C 35 mm f/4 (made for the German Kodak camera, the lens only incorporates the front optical block and has no aperture ring, these are part of the camera) Retina-Curtar-Xenon C 35 mm f5.6 (made for the German Kodak camera, the lens only incorporates the front optical block and has no aperture ring, these are part of the camera) Radiogon 35 mm f/4.0 Radionar A 3-element, 3-group design with a minimum aperture of f/22. 40 mm f/2.8 35mm f 4.0 with a minimum aperture of f/22. Lens is the same as Curtagon version, only serial numbers are earlier. Reomar A 3-element, 3-group design with a minimum aperture of f/22. 45 mm f/2.8 Super-Angulon 21 mm f/4.0 A 9/4