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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.
The T-mount is a solely mechanical specification. Electrical or mechanical connections (such as for autofocus) are generally not provided, although Sigma's YS Mount featured an automatic diaphragm coupling. Besides cameras, T-mounts are used in optical breadboard prototyping components as well as telescope and microscope attachments. The T ...
Condensers typically consist of a variable-aperture diaphragm and one or more lenses. Light from the illumination source of the microscope passes through the diaphragm and is focused by the lens(es) onto the specimen. After passing through the specimen the light diverges into an inverted cone to fill the front lens of the objective.
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
The first Minolta SLRs were marketed with SR- model numbers starting from 1958 with the Minolta SR-2, which featured semi-automatic diaphragm operation with Auto-Rokkor lenses: winding the film advance lever opened the diaphragm and cocked the shutter; when the shutter was released, the iris would stop down to the selected aperture.
The earliest lenses had pre-set and manual aperture controls. Lens engraving included "Rokkor" branding, basic construction details, maximum aperture (1:nnn), and focal length (f=nn mm). AR (I) 1958 – 1960 These were contemporaneous with the SR lenses, and had automatic diaphragm, as designated by the engraved "Auto Rokkor" (AR) name. AR (II)
Many of the lenses released for the Canon R mount have an automatic or semi-automatic diaphragm. These are distinguished by the name of the lens: "Super-Canomatic R" lenses are equipped with an automatic diaphragm, while "Canomatic R" lenses have a semi-automatic diaphragm, and a "Canon Lens R" has either a manual preset or manual diaphgram.
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.
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