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The M42 lens mount is a screw thread mounting standard for attaching lenses to 35 mm cameras, primarily single-lens reflex models. It is more accurately known as the M42 × 1 mm standard, which means that it is a metric screw thread of 42 mm diameter and 1 mm thread pitch.
M42 thread mount cameras first became well known under the Praktica brand, and thus the M42 mount is known as the Praktica thread mount.[1] Since there were no proprietary elements to the M42 mount, many other manufacturers used it; this has led to it being called the Universal thread mount or Universal screw mount by many.
Cameras using the M42 lens mount, also known as the Pentax screw mount. Asahi Pentax (1957) — also sold as the Tower 26; Asahi Pentax S (1958) — also sold as the Tower 26; Asahi Pentax K (1958) — also sold as the Tower 29; Asahi Pentax S2/H2 (1959) — also sold as the Honeywell Pentax H2/Honeywell Heiland Pentax H2
But this lens was also manufactured in M42 mount, M39 mount (which shouldn't be confused with Leica thread mount, this is an SLR version of the lens for early Zenit SLRs), and proprietary Kiev SLR mount (used on Kiev 10 and Kiev 15 cameras). There also existed a variation of the lens called the Jupiter-11A.
After the Zeiss Ikon camera company declared bankruptcy in the early 1970s, Rollei acquired the Voigtländer brand in 1972 along with several camera designs, [3] including the SL 706, an M42 lens mount camera that was derived from the earlier Icarex 35S and was intended to unify the diverse SLR lines offered by Zeiss Ikon. The SL 706 was ...
What set these cameras apart from earlier Pentax ones was the replacement of the M42 "universal" screw-lens mount with a proprietary bayonet mount system, known as the K mount. Still the basis for Pentax lenses and cameras today, the K mount offered greater convenience and enabled the production of faster lenses such as the 50 mm f /1.2. [17]