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Celestron was the first large scale commercial manufacturer of the Schmidt-Cassegrain telescope, introducing its "C8" 8" diameter 2032 mm focal length, ƒ10 telescope in 1970. [7] The primary innovation Celestron/Tom Johnson devised was a method to produce Schmidt corrector plates using a vacuum to pull the glass blanks into a pre-shaped curve ...
Regulus through Celestron CGEM DX 1100 @ F6.3, Canon T3i, Televue 4X Powermate, ISO 800, 30 sec exposure. The Regulus system as a whole is the twenty-first brightest star in the night sky with an apparent magnitude of +1.35. The light output is dominated by Regulus A. Regulus B, if seen in isolation, would be a binocular object of magnitude +8. ...
Birdwatching is a very popular hobby among nature and animal lovers; a binocular is their most basic tool because most human eyes cannot resolve sufficient detail to fully appreciate and/or study small birds. [74] To be able to view birds in flight well rapid moving objects acquiring capability and depth of field are important.
The Celestron 8 was more compact, affordable and easier to manufacture than traditional telescopes, like the Schmidt–Cassegrain. [2] Johnson's new telescope proved very popular in the amateur astronomy and educational industries, allowing the hobby to rapidly expand and reach more consumers. [2] Johnson sold Celestron in 1980. [2]
DXing, taken from DX, the telegraphic shorthand for "distance" or "distant", [1] is the hobby of receiving and identifying distant radio or television signals, or making two-way radio contact with distant stations in amateur radio, citizens band radio or other two-way radio communications.
The 55-200mm AF-S lens is a medium telephoto zoom lens manufactured by Nikon for use on Nikon DX format digital SLR cameras. It comes in three variants: AF-S DX Zoom-Nikkor 55-200mm f /4–5.6 G ED, released in 2005 [1] AF-S DX Zoom-Nikkor 55-200mm f /4–5.6 G VR IF-ED, released in 2007, adds internal focusing (IF) and, most notably, vibration ...
Some prime lenses, primarily telephoto lenses, were introduced with "internal focusing," (IF) such as the Nikkor 400mm f/3.5 IF-ED (Japan, 1976) [160] and Nikkor 200mm f/2 IF-ED (Japan, 1977). [161] Focusing by moving only a few internal elements, instead of the entire lens, ensured the lens' weight balance would not be upset during focusing.
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 ...
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