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Porro prisms are most often used in pairs, forming a double Porro prism. A second prism rotated 90° with respect to the first, is placed such that light will traverse both prisms. The net effect of the prism system is a beam parallel to but displaced from its original direction, with the image rotated 180°. A double Porro system provides four ...
Prism lighting is the use of prisms to improve the distribution of light in a space. It is usually used to distribute daylight , and is a form of anidolic lighting . Prism lighting was popular from its introduction in the 1890s through to the 1930s, when cheap electric lights became commonplace and prism lighting became unfashionable.
Optical coating. An optical coating is one or more thin layers of material deposited on an optical component such as a lens, prism or mirror, which alters the way in which the optic reflects and transmits light. These coatings have become a key technology in the field of optics. One type of optical coating is an anti-reflective coating, which ...
Optical contact bonding. Gauge blocks wrung together and held horizontally. The blocks are held together solely by the adhesion of their extremely flat surfaces, which is so strong that it easily supports their weight. Optical contact bonding is a glueless process whereby two closely conformal surfaces are joined, being held purely by ...
Wray (Optical Works) Ltd. Wray (Optical Works) Ltd. was a British camera and lens manufacturer based in Ashgrove Road, Bromley, Kent, UK. It operated from 1850 to 1971, making lenses for cameras, photographic enlargers, reconnaissance, mapping, microchip replication, and an anamorphic projection system for cinemas. It also made binoculars.
The 35mm SLR camera Alpa-Reflex has its origins back in the 1930s when a Swiss precision mechanical manufacturer decided to diversify their product range, having mainly relied on manufacturing parts for the watch industry. They sought outside assistance and by 1939 the plans were ready and building cameras commenced at a very slow rate.