narrow+aperture
121Olympus OM system — The Olympus OM System was a line of 35mm single lens reflex cameras, lenses and accessories sold by Olympus between 1972 and 2002 (some accessories were sold through early 2003). The system was introduced by Olympus in 1972, more than a decade… …
122Fresnel diffraction — In optics, the Fresnel diffraction equation for near field diffraction, is an approximation of Kirchhoff Fresnel diffraction that can be applied to the propagation of waves in the near field.[1] The near field can be specified by the Fresnel… …
123Earth Sciences — ▪ 2009 Introduction Geology and Geochemistry The theme of the 33rd International Geological Congress, which was held in Norway in August 2008, was “Earth System Science: Foundation for Sustainable Development.” It was attended by nearly… …
124Diopter sight — Target shooting diopter of a 10 metre air rifle with a mounted occluder for the non aiming eye The diopter is an aperture sight component used to assist the aiming of a guns/devices, usually those intended to launch projectiles, such as firearms …
125Dobsonian telescope — A Dobsonian telescope on display at Stellafane in the early 1980s A Dobsonian telescope is an alt azimuth mounted newtonian telescope design popularized by the amateur astronomer John Dobson starting in the 1960s. Dobson s telescopes featured a… …
126Shutter (photography) — The 1911 Cyclopedia of Photography divides shutters into roller blind and diaphragm types, corresponding roughly to the modern focal plane and leaf types. In photography, a shutter is a device that allows light to pass for a determined period of… …
127eye, human — ▪ anatomy Introduction specialized sense organ capable of receiving visual images, which are then carried to the brain. Anatomy of the visual apparatus Structures auxiliary to the eye The orbit The eye is protected from mechanical injury… …
128Human Race — Human Race † Catholic Encyclopedia ► Human Race Mankind exhibits differences which have been variously interpreted. Some consider them so great that they regard the varieties of the human race as distinct species; others maintain the… …
