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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.
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.
Helios 44-2 lens mounted on a Praktica MTL 5B Helios 44M-4 lens, 58mm f/2, in M42 screw mount Helios 40-2 Helios 81M 53mm f/2 lens mounted on Kiev 19. Helios (Russian: Ге́лиос) was a type of camera lenses, made in the USSR.
N/A. Screw mount must be adjusted manually for back focus. Back focal distance from <1mm to 12mm. 1/6" to 1" 12 mm 0.5 mm pitch Screw CCTV, PCB: Edmund Optics μ-Video Bolex Bajonet 23.22 mm 16 mm: Breech lock Cinematography effective focal distance 17.526 mm (0.69 inches) due to beam splitter behind mount flange (accepts C-mount lenses with ...
Closest focus Smallest field Focusing Weight Length Diameter Hood Filter 8 mm F2.8 Fisheye 180° (circle) 11–7 Auto 2.8–22 0.2 m - Straight helicoid 640 g 82 mm 102 mm Not necessary Built-in (L39,Y48, O56,R60) 16 mm F3.5 Fisheye 180° 11–8 Auto 3.5–22 0.2 m - Straight helicoid 180 g 31 mm 59 mm Not necessary Built-in (L39,Y48, O56)
Soft focus ring: This ring is found only on the 135 mm 'Soft Focus' prime lens, and enables a variable soft focus effect from completely sharp (0) to very soft (2), although it has little effect when used with apertures over f/5.6. Although the ring can be set to any position, two 'stops' are implemented at positions 1 and 2.
The AR-mount lenses may be divided into several types, based mostly on cosmetics. When the Autoreflex T was introduced in 1967, Konica added a lever to signal the widest aperture setting for the through-the-lens (TTL) in-body light meter; Konica also offered a free service to retrofit the earliest AR-mount lenses with the new lever.
Since extension tubes do not have optics, they do not affect the optical quality of a lens. Due to their function, there are other effects: decrease of light; shallower depth of field; and loss of ability to focus at infinity. The longer the extension tube, the closer the lens can focus.
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