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8×42 roof prism binoculars with rainguard and opened tethered lens caps. Binoculars or field glasses are two refracting telescopes mounted side-by-side and aligned to point in the same direction, allowing the viewer to use both eyes (binocular vision) when viewing distant objects.
The widest two components of the system are easily separated when viewed through binoculars, or even with the naked eye under excellent conditions. [ 9 ] The northern component is called ε 1 (ADS 11635 AB in multiple star notation) and the southern ε 2 (ADS 11635 CD); they lie around 160 light years from Earth and orbit each other over ...
An astronomical instrument is a device for observing, measuring, or recording astronomical data. [citation needed] They are used in the scientific field of astronomy, a natural science that studies celestial objects and the phenomena that occur in the cosmos, with the object of explaining their origin and evolution over time.
NGC 281, IC 11 or Sh2-184 is a bright emission nebula and part of an H II region in the northern constellation of Cassiopeia and is part of the Milky Way's Perseus Spiral Arm.
Perger-Prism beam path; the cemented plane is colored blue Leica GEOVID 8×42 HD-B laser rangefinding "Perger–Porro prism system" binoculars that have a 14 mm (0.55 in) eyepiece/objective axis offset used by a hunter. A Perger prism or Perger–Porro prism system is a prism, that is used to invert
The original intent of the Dobsonian design was to provide an affordable, simple, and rugged large-aperture instrument at low cost. [18] These same attributes facilitate their mass production. One of the first companies to offer Dobsonian telescopes commercially was the now defunct company Coulter Optical (now part of Murnaghan Instruments).
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