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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:
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.
The Fujica X-mount was a lens mount created by Fujifilm in the late 1970s and early 1980s for the new Fujica SLR lineup: AX-1, AX-3, AX-5, AX Multi, STX-1, STX-1N, STX-2, MPF105X, MPF105XN. It replaced the M42 screw mount used on their earlier SLRs. The mount is a bayonet type, with a 65° clockwise lock, and a flange focal distance of 43.5 mm. [1]
Cosina started producing cameras and lenses under the Voigtländer brand in 1999, when it introduced a new M39 mount body and lenses. It has since produced a prodigious variety of these lenses in M39x26, Leica M mount, Nikon S rangefinder mount (some fully usable with Contax RF bodies), and SLR mounts including M42 and Nikon F.
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.