wide-angle lens with a minimum aperture of f/22 21 mm f/3.4 An update of the f/4.0 model, with an 8/4 design and slightly increased sharpness. Super-Angulon R A 10/8 wide-angle lens with a minimum aperture of f/22. 21 mm f/4 PC-Super-Angulon A 28 mm f/2.8 shift lens with 67EW filter thread and a lens shade with filter holder for 74R rimless filters and M92x1.00 filter ring. Many user-changeable mechanically-only mount modules available from Schneider Kreuznach. Also available as Leica PC-Super-Angulon R 28 mm f/2.8 with Leica R mount. Can be modified from a shift-only lens to a tilt-only lens by the German company. SUPER-ANGULON 28 f/2.8 for Canon EF and Nikon F mount (2014) SUPER-ANGULON 50 f/2.8 for Canon EF and Nikon F mount (2014) Tele-Arton 85 mm f/4 90 mm f/4 Tele-Variogon 80–240 mm f/4 Tele-Xenar 5 cm f/5.5 (early 1930s) 75 mm f/3.8 90 mm f/3.5 100 mm f/3.8 135 mm f/3.5 135 mm f/4 150 mm f/4 150 mm f/4.5 200 mm f/5.5 240 mm f/4.5 240 mm f/5.5 360 mm f/5.5 Variogon The first variable-focal-length lens with fixed back focal distance for 35 mm cameras, introduced in 1964. 45–100 mm f/2.8 80–240 mm f/4 These lenses were available with 19 interchangeable mounts (loosen two screws and replace with a different mount). The mounts each have a small number on them and equate as follows: Type of mount 2 = M42 (Pentax Screw, Universal Screw, etc.) 3 = Exacta Bayonet 4 = Alpa Bayonet 10 = Canon FD 11 = C Mount 13 = Nikon F 14 = Leica R 15 = Contare ? = Arriflex ? = Arri MT? Production of the 80–240 mm f/4 is said to be approximately 250 units, the 45–100 mm f/2.8 about 57 units. The 80–240 is split amongst two different variants. Xenagon 4 elements in 3 groups of genre "Wide Angle Tessar" 30 mm f/3.5 35 mm f/2.8 35 mm f/3.5 (Voss Diax mount) 35 mm f/4.0 Xenar The Xenar uses a Tessar type optical formula, originally designed by Paul Rudolph for Zeiss (4 elements in 3 groups, with the rear element consisting of a cemented doublet). The formula could only be used by Schneider Kreuznach after the original 1902 Tessar patent had expired in 1919. Many other famous lenses with large production runs were based on this formula (e.g. Leitz Elmar, Voigtländer Skopar, Kodak Ektar). 38mm f/2.8 (for 24x24mm)