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Launch numerical aperture - In telecommunication, launch numerical aperture (LNA) is the numerical aperture of an optical system used to couple (launch) power into an optical fiber.
Angular aperture - The angular aperture of a lens is the apparent angle of the lens aperture as seen from the focal point:
Dobsonian - In astronomy the Dobsonian is a type of alt-azimuth telescope mounting that became popular among amateur astronomers in the 1980s because of its extreme simplicity, low price, and rugged construction. The terms "Dobsonian" or "Dob" may also refer to any telescope that features this type of mount, although the telescopes themselves are typically of Newtonian design.
Inferior thoracic aperture - The inferior thoracic aperture is much larger than the superior thoracic aperture. It is closed by the diaphragm, which separates the thoracic and abdominal cavities.
Starbuckets Telescopes - Builds premium truss-tube Dobsonian reflectors in small to medium apertures. These apertures fill the void in commercially available, small to mid-sized truss-tube Dobsonians.
Webster Telescopes - Manufacturer of Dobsonian telescopes in sizes from 22 inches to 40 inches in aperture. Fully computerized GOTO control systems are available using either the ArgoNavis or ServoCat electronics. Product lines feature Kennedy Optics throughout.
Obsession Telescopes - Manufacturer of Dobsonian telescopes ranging from 12-1/2" to 30" in aperture. Optional accessories include the ServoCAT servo drive system which may be combined with the Argo Navis digital setting circles.
Source: BazSites.net
Dobsonian Telescope - ... the upcoming transits of Venus. It also discusses Dobsonian telescopes, with hints on using personal computers and ... backgrounds. No previous knowledge of astronomy is needed. Dobsonian - In astronomy the Dobsonian is a type of alt-azimuth telescope ...
Collimating Dobsonian Telescope - Collimating Dobsonian Telescope Turn Left at Orion: A Hundred Night ... the upcoming transits of Venus. It also discusses Dobsonian telescopes, with hints on using personal computers and ... is interested in the history of telescope-making. Dobsonian - In astronomy the Dobsonian is a type ...
Questar Telescope - ... the refracting telescope with the lower cost per aperture of the reflecting telescope. Dobsonian telescope - In amateur astronomy the Dobsonian telescope is a type of telescope design ...
Carol Alt Photo - ... included) that powers the telescope for about ... the Dobsonian telescope is a type of telescope design that ... the building of extremely simple and rugged large-aperture telescopes at low cost. The term "Dobsonian" or "Dob" refers to any telescope with ...
Carol Alt Photo - ... included) that powers the telescope for about ... the Dobsonian telescope is a type of telescope design that ... the building of extremely simple and rugged large-aperture telescopes at low cost. The term "Dobsonian" or "Dob" refers to any telescope with ...
Carol Alt Photo - ... included) that powers the telescope for about ... the Dobsonian telescope is a type of telescope design that ... the building of extremely simple and rugged large-aperture telescopes at low cost. The term "Dobsonian" or "Dob" refers to any telescope with ...
Carol Alt Photo - ... included) that powers the telescope for about ... the Dobsonian telescope is a type of telescope design that ... the building of extremely simple and rugged large-aperture telescopes at low cost. The term "Dobsonian" or "Dob" refers to any telescope with ...
Carol Alt Photo - ... included) that powers the telescope for about ... the Dobsonian telescope is a type of telescope design that ... the building of extremely simple and rugged large-aperture telescopes at low cost. The term "Dobsonian" or "Dob" refers to any telescope with ...
Celestron FirstScope Telescope : Celestron FirstScope Telescope: Official Product of the International Year of Astronomy 2009. Names of pioneering astronomers displayed around the optical tube of the Celestron FirstScope Telescope High quality Dobsonian style stand 76 mm reflector optical tube Ideal entry-level astronomers. Portable and lightweight table-top design Easy to store, transport and setup The Celestron FirstScope Telescope makes a wonderful keepsake for anyone interested in astronomy Optical Design: Dobsonian Reflector Aperture: 76 mm (2.99 in) Focal Length:300 mm (11.81 in) Focal Ratio: 3.95 Eyepiece 1: 20 mm (0.79 in) Magnification 1: 15 x Eyepiece 2: 4 mm (0.16 in) Magnification 2: 75 x Weight: 69 oz (1956.12 g) Model:
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