A telescope is an instrument designed for the observation of remote
objects and the collection of electromagnetic radiation.
The name "telescope" covers a wide range of instruments and is difficult to
define. They all have the attribute of collecting electromagnetic radiation so
it can be studied or analyzed in some manner. The most common type is the
optical telescope. Other types also exist and are listed below.
Optical telescopes
An optical telescope gathers and focuses light mainly from the visible part of
the Electromagnetic spectrum and are used for astronomy and in many
non-astronomical instruments, including: theodolites (including transits),
spotting scopes, monoculars, binoculars, camera lenses, and spyglasses. There
are three main types:
The refracting telescope which uses solely an arrangement of lenses .
The reflecting telescope which uses solely an arrangement of mirrors .
The catadioptric telescope which uses a combination of mirrors and lenses
Radio telescopes
Radio telescopes are directional radio antennae that often have a parabolic
shape. The dishes are sometimes constructed of a conductive wire mesh whose
openings are smaller than the wavelength being observed. Radio telescopes are
also used to collect microwave radiation, often used to help study the leftover
Big Bang radiation, and also can be used to collect radiation when visible light
is obstructed or faint, such as from quasars.
X-ray and gamma-ray telescopes
X-ray and gamma-ray radiation go through most metals and glasses, some X-ray
telescopes use Wolter telescopes composed of ring-shaped "glancing" mirrors,
made of heavy metals, that reflect the rays just a few degrees.
Telescopes
Catadioptric, Reflectors ,Refractors ,Computerized , Under 80mm Aperture ,
80 to 90mm Aperture , 100 to 150mm Aperture,150 to 200mm Aperture ,
Over 200mm Aperture , Meade ETX Series , Telescope Accessories.
Adorama ,Barska, Bower , Bushnell , Canon , Carson , Carson
Optical , Celestron ,
CSN , Cstar , Digi-T , Digital Concepts , Digital Innovations
, Fuji ,
Galileo , Galileo Visions, Inc , Gibraltar , Hewlett-Packard ,
Kendrick ,
Konus , Lenmar , Lumicon , Mead , Mead Products , Meade ,
Meade Instruments, Merkury Optics , Orion , ORION, Pentax ,
Phoenix , Prime Entertainment , Pro Power, Raynox ,
Rigel Systems , Samsung, Satechi , Solarscope ,
Starbound, Tele Vue ,
Thousand Oaks , Unknown , VCC113 , Vixen , Walkstool, William Optics,
Zeiss , Zhumell ,Zhumell, Inc.,ZigView . |
