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The predecessor of Celestron was Valor Electronics, an electronics and military components firm founded in 1955 by Tom Johnson. [1] [2] [3] Johnson became involved with telescopes when he built a 6" reflecting telescope for his two sons. [2] In 1960, Johnson established the "Astro-Optical" division of Valor, which would later become Celestron. [3]
Nikon announced the lens on 22 July 2003. [2] It was the first prime lens released by Nikon specifically designed for Nikon DX format DSLR cameras. The lens produces a distinctive rectangular fisheye image, which fills the DX format frame (as opposed to a circular fisheye lens which produces a circular image).
A DX-pedition is an expedition to what is considered an exotic place by amateur radio operators and DX listeners, typically because of its remoteness, access restrictions, or simply because there are very few radio amateurs active from that place. This could be an island, a country, or even a particular spot on a geographical grid.
TV DX and FM DX is the active search for distant radio or television stations received during unusual atmospheric conditions. The term DX is an old telegraphic term meaning "long distance."
The switching between white and colored reflection is fast enough to display video content. [24] It is a low-power, low-voltage technology, and displays based on the effect can be made flat and thin. The reflectivity and contrast are better than or equal to other reflective display types and approach the visual qualities of paper.
Schematic of a typical EDXRD experiment. Energy-dispersive X-ray diffraction (EDXRD) is an analytical technique for characterizing materials.It differs from conventional X-ray diffraction by using polychromatic photons as the source and is usually operated at a fixed angle. [1]
Scenes of a Sexual Nature is a 2006 British comedy-drama film directed by Ed Blum and starring an ensemble cast which includes Ewan McGregor, Adrian Lester, Eileen Atkins, Andrew Lincoln, Gina McKee, Sophie Okonedo, and Hugh Bonneville. The film follows a series of seven loosely related stories of couples on Hampstead Heath in north London. The ...