frame counter on top of the wind-on knob. Soon the frame counter was placed under wind-on knob. The name on the front plate was at first in a Gothic style, while all later cameras have the characteristic slanted script name plate. In 1940 the rewind knob becomes smaller - Ø21 mm, while the wind-on knob is Ø27 mm. Cameras with brown, dark brown, red and possibly dark green leather covering are alternatives to the black leather, some have grey or black metal finish. Flat patent carrying strap fixtures are introduced. In 1941 ordinary strap lugs on either side of the body. In 1946 only black leather and black metal finish with name filled in white enamel. In 1947 black and chrome camera with large wind on knob with frame counter on the top. Later models In 1947 an improved Praktiflex version was launched with a new internal mechanism and a shutter release at the front that releases a spring-loaded mirror, which does not return until the camera is wound-on for the next frame. The name is embossed in gothic letters, otherwise the external body features is quite similar to those of the original model. This version is known as the Praktiflex II by collectors. The lens mount is at first the 40mm screw, but later cameras have the new 42mm lens mount, first used on the Contax S and the Praktica of 1949, since production lasted until 1951. Lenses Only a small selection of standard lenses became available, e.g.: Schneider-Kreuznach Xenar f:3.5 F = 5 cm Schneider-Kreuznach Xenar f:2.8 F = 5 cm Schneider-Kreuznach Xenon f:2 F = 5 cm > Victar < 1:2.9 F = 5 cm *Anastigmatic Carl Zeiss Tessar 1:3.5 f = 5 cm Carl Zeiss Tessar 1:2.8 f = 5 cm Carl Zeiss Biotar 1:2 f = 5 cm SOM Berthiot Flor 1:1,5 f = 55 mm References 135 film cameras SLR cameras