aperture mirror
71Bernhard Schmidt — Bernhard Woldemar Schmidt (March 30, 1879 ndash; December 1, 1935) was an Estonian Swede optician who spent his adult life in Germany. In 1930 he invented the Schmidt telescope which corrected for the optical errors of spherical aberration, coma …
72History of optics — Optics began with the development of lenses by the ancient Egyptians and Mesopotamians, followed by theories on light and vision developed by ancient Greek and Indian philosophers, and the development of geometrical optics in the Greco Roman… …
73Meniscus corrector — Albert Bouwers 1941 catadioptric telescope with a concentric meniscus corrector A meniscus corrector is a negative meniscus lens that is used to correct spherical aberration in image forming optical systems such as catadioptric telescopes. They… …
74Timeline of telescopes, observatories, and observing technology — Timeline of telescopes, observatories, and observing technology.Before Common Era (B.C.)2100*Xiangfen Astronomical Observatory, Xiangfen County, Linfen City, Shanxi Province, China 1100* 11th 7th century B.C., Zhou dynasty astronomical… …
75Mamiya — Digital Imaging Co., Ltd. Type Camera and lens manufacturer Industry Digital imaging and photography Founded May 1940 Headquarters Tokyo, Japan Key people …
76Focus (optics) — An image that is partially in focus, but mostly out of focus in varying degrees. In geometrical optics, a focus, also called an image point, is the point where light rays originating from a point on the object converge.[1] Although the focus is… …
77Nikon FE — with Nikkor 50mm f/1.4 lens Maker Nippon Kogaku K. K. Type 35mm film SLR Lens mount Nikon F lens mount …
78Canon New F-1 — The Canon New F 1 replaced the F 1n (an upgraded F 1) as Canon s top of the line 35mm single lens reflex camera in 1981. Like the earlier models, the New F 1 takes FD mount lenses. Although no date has ever been confirmed, it is thought that the… …
79photography, history of — Introduction method of recording the image of an object through the action of light, or related radiation, on a light sensitive material. The word, derived from the Greek photos (“light”) and graphein (“to draw”), was first used in the… …
80Overwhelmingly Large Telescope — Organization European Southern Observatory Wavelength In …
