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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.
A lens mount is an interface – mechanical and often also electrical ... M42: 45.46 mm 35 mm: 42 mm 1 mm Screw Photography Praktica, [11] Pentax, Zenit B4-mount:
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.
T-mount to M42 mount adapter ring. Because the T-mount lenses have a long flange distance of 55 mm and most 35 mm cameras have shorter flange distances, a simple mechanical adapter called T-Ring is needed to adapt a T-mount lens to any camera body without optical correction to achieve its closest focus distance.
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The M42 screw-mount system was used by Pentax prior to the introduction of the K-mount. Pentax designed the K-mount wide enough to allow an adapter to fit between the M42 thread and the K bayonet. They also kept the same flange focal distance (also called registration distance or register) as the M42 screw-mount, so that M42 lenses focus ...
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The M42 mount was a very popular interchangeable lens mount system for a quarter century. It was used by almost two dozen different SLR brands, most notably Asahi Pentax. [408] (Asahi became so closely associated with this mount that it was, and still is, often erroneously referred to as the Pentax screw mount.