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An adapter for automatic-diaphragm M42 lens mount interchangeable lenses for Praktica and Pentax was available as an accessory for photographers migrating from the earlier system. [2] Zeiss-designed Planar lenses built by Rollei: (L) earlier version, with metal focus ring; (R) later production, with plastic focus ring
Nine-blade iris Pentacon 2.8/135 lens with 15-blade iris Aperture mechanism of Canon 50mm f/1.8 II lens, with five blades In the human eye, the iris (light brown) acts as the diaphragm and continuously constricts and dilates its aperture (the pupil) A 750nm titanium-sapphire laser beam passing through an iris diaphragm, while opening and closing the iris.
All lenses for these mounts are interchangeable between older and newer Minolta manual focus 35 mm film SLR bodies. There are exceptions, such as, the lenses before 1961 feature a slightly different aperture leverage, and thus the automatic diaphragm may not work correctly on post-1961 cameras, and later MC/MD tabs may hit a screw of the front cover on earlier cameras.
The Quick Bayonet Mount (QBM) is the bayonet mount system for the range of interchangeable lenses fitted to 135 film cameras built by Rollei in Germany and Singapore from 1970 through 1990, including the Rolleiflex SL35, Rolleiflex SL2000F, and Voigtländer VSL series. Lens brands sold with QBM included Carl Zeiss, Rolleinar, Schneider, and
The semi-automatic diaphragm works in the same way, with a small exception: the aperture does not return to fully open until after the photographer winds the film on following the exposure. Other lenses have a manual pre-set or fully manual diaphragm. [3] Super-Canomatic R lenses are equipped with two diaphragm control rings.
The back focus of the body was the thinnest of any 35 mm camera, and as a result, it was possible to make adapters to use lenses designed for almost any other 35 mm SLR on an Alpa. Adapters offered included Exakta, M42 (automatic diaphragm and manual), Nikon (auto and manual), Leicaflex, T-mount, and Contax.
For example, an "Olympus OM-SYSTEM G.Zuiko Auto-S 1:1.4 f=50mm" is a lens with a 'Standard' focal length and a maximum aperture of f / 1.4 featuring a seven-element construction and an automatic diaphragm, built for the OM-system. The use of 'standard' refers to the focal length compared to the diagonal dimension of the imager; in this case ...
Zenit 122 Zenit-4 with leaf shutter Zenit-16 with vertical travel shutter. The first attempt to make high-end professional camera by KMZ was the Start in 1958. This camera had a full set of shutter speeds (from 1 sec to 1/1000), a lens with an automatic diaphragm in a unique breech-lock mount, and even a knife for cutting-off part of the unexposed film.
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