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refracting telescope | A Wisdom Archive on refracting telescope | | refracting telescope A selection of articles related to refracting telescope | |
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Refracting telescope
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| ARTICLES RELATED TO refracting telescope | | | | |  refracting telescope: Encyclopedia II - Skygazing - Naked eye skygazing
Skygazing - Diurnal observation.
The extreme brightness of the Sun saturates the sky and prevents the observation of less luminous objects, with the exception of the Moon, and occasionally Venus. The observation of the daytime sky can reveal some surprises nevertheless. With some additional equipment sunspots can be viewed during the day, as well as the occasional solar eclipse. It is extremely important to have the proper equipment and training when observing the sun, or you could permanently blind yourself. Never attempt to observe the sun in a telescope or binoculars w ...
See also:Skygazing, Skygazing - Naked eye skygazing, Skygazing - Diurnal observation, Skygazing - Nocturnal observation, Skygazing - Binocular gazing, Skygazing - Choice of binoculars, Skygazing - Advice on observational techniques, Skygazing - Observations with a refracting telescope, Skygazing - Choice of the refracting telescope, Skygazing - Advice of usage, Skygazing - The observation with a reflecting telescope, Skygazing - Types of reflecting telescope Read more here: » Skygazing: Encyclopedia II - Skygazing - Naked eye skygazing |
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| | | | | refracting telescope: Encyclopedia II - Skygazing - The observation with a reflecting telescope A reflecting telescope is constituted not of lenses but of mirrors. It being less costly to manufacture, one can, for the price of a refracting telescope, acquire an instrument of the more important diameter that gives access to the deep space. Nevertheless, to take advantage of the power of a reflecting telescope, it is necessary to have a good site of observation safe from the lights of the city, otherwise the usage of a good telescope is preferable.
With a 150mm lensed reflecting telescope, the viewer is able to distinguish the spi ...
See also:Skygazing, Skygazing - Naked eye skygazing, Skygazing - Diurnal observation, Skygazing - Nocturnal observation, Skygazing - Binocular gazing, Skygazing - Choice of binoculars, Skygazing - Advice on observational techniques, Skygazing - Observations with a refracting telescope, Skygazing - Choice of the refracting telescope, Skygazing - Advice of usage, Skygazing - The observation with a reflecting telescope, Skygazing - Types of reflecting telescope Read more here: » Skygazing: Encyclopedia II - Skygazing - The observation with a reflecting telescope |
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| | | | | refracting telescope: Encyclopedia II - Skygazing - Binocular gazing Binoculars are very useful when you wish to observe bright, large astronomical objects. Thanks to them it is possible to see lunar craters. In spite of the distance between us and the Moon, one can observe the relief of these craters along the terminator, the separation line between the illuminated and darkened parts of the Moon. Lunar features are emphasized in this zone where sunlight strikes at a low angle and casts long shadows. This spectacle ...
See also:Skygazing, Skygazing - Naked eye skygazing, Skygazing - Diurnal observation, Skygazing - Nocturnal observation, Skygazing - Binocular gazing, Skygazing - Choice of binoculars, Skygazing - Advice on observational techniques, Skygazing - Observations with a refracting telescope, Skygazing - Choice of the refracting telescope, Skygazing - Advice of usage, Skygazing - The observation with a reflecting telescope, Skygazing - Types of reflecting telescope Read more here: » Skygazing: Encyclopedia II - Skygazing - Binocular gazing |
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| | | | | refracting telescope: Encyclopedia II - Telescope - Imperfect images No telescope can form a perfect image. Even if a reflecting telescope could have a perfect mirror, or a refracting telescope could have a perfect lens, the effects of aperture diffraction could still not be escaped. In reality, perfect mirrors and perfect lenses do not exist, so image aberrations in addition to aperture diffraction must be taken into account. Image aberrations can be broken down into two main classes, monochromatic, and polychromatic. In 1857, Philipp Ludwig von Seidel (1821-1896) decomposed the first order monochromatic aberrations into five constituent aberrations. They are now common ...
See also:Telescope, Telescope - History, Telescope - Types, Telescope - Telescope mountings, Telescope - Research telescopes, Telescope - Imperfect images, Telescope - The five Seidel aberrations, Telescope - The chromatic aberrations, Telescope - Famous optical telescopes, Telescope - Related lists Read more here: » Telescope: Encyclopedia II - Telescope - Imperfect images |
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| | | | | refracting telescope: Encyclopedia II - Reflecting telescope - Focal planes
Reflecting telescope - Prime focus.
In a prime focus design in large observatory telescopes, the observer sits inside the telescope, at the focal point of the reflected light. In the past this would be the astronomer himself, but nowadays CCD cameras are used.
Radio telescopes often have a prime focus design. The mirror is replaced by a metal surface for reflecting radio waves, and the observer is an antenna.
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See also:Reflecting telescope, Reflecting telescope - Technical considerations, Reflecting telescope - Reflecting telescope designs, Reflecting telescope - Newtonian focus, Reflecting telescope - Cassegrain focus, Reflecting telescope - Schmidt camera, Reflecting telescope - Focal planes, Reflecting telescope - Prime focus, Reflecting telescope - Coudé focus Read more here: » Reflecting telescope: Encyclopedia II - Reflecting telescope - Focal planes |
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| | | | | | refracting telescope: Encyclopedia II - Telescope - History The first telescopes may have been Assyrian crystal lenses. Article
The Visby lenses tentatively suggest that the technology was known to the Arabs and Persians then to the Vikings in the 10th century. Leonard Digges is sometimes credited with the invention in England in the 1570s, but usually credit for assembling the first telescope is usually given to an unknown Dutch spectacle maker in about 1608. Some name that person as Hans Lippershey (c1570-c1619), but Jacob Metius and Zacharias Jansen also claimed to have invented a telescope ...
See also:Telescope, Telescope - History, Telescope - Types, Telescope - Telescope mountings, Telescope - Research telescopes, Telescope - Imperfect images, Telescope - The five Seidel aberrations, Telescope - The chromatic aberrations, Telescope - Famous optical telescopes, Telescope - Related lists Read more here: » Telescope: Encyclopedia II - Telescope - History |
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| | | | | refracting telescope: Encyclopedia II - Reflecting telescope - Focal planes
Reflecting telescope - Prime focus.
In a prime focus design, the observer sits inside the telescope, at the focal point of the reflected light. In the past this would be the astronomer himself, but nowadays CCD cameras are used.
Radio telescopes often have a prime focus design. The mirror is replaced by a metal surface for reflecting radio waves, and the observer is an antenna.
...
See also:Reflecting telescope, Reflecting telescope - Technical considerations, Reflecting telescope - Reflecting telescope designs, Reflecting telescope - Schmidt camera, Reflecting telescope - Newtonian focus, Reflecting telescope - Cassegrain focus, Reflecting telescope - Focal planes, Reflecting telescope - Prime focus, Reflecting telescope - Coudé focus Read more here: » Reflecting telescope: Encyclopedia II - Reflecting telescope - Focal planes |
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| | | | | refracting telescope: Encyclopedia II - Telescope - History The first telescopes may have been Assyrian crystal lenses. Article
Though the Visby lenses tentatively suggest that the technology was known to the Arabs and then to the Vikings in the 10th century, credit for assembling the first telescope is usually given to an unknown Dutch spectacle maker in about 1608. Some name that person as Hans Lippershey (c1570-c1619). Even if Lippershey did not make the first one, he publicized it. Galileo Galilei made his own telescope in 1609, calling it at first a perspicillum, and then using the ...
See also:Telescope, Telescope - History, Telescope - Types, Telescope - Telescope mountings, Telescope - Research telescopes, Telescope - Imperfect images, Telescope - The five Seidel aberrations, Telescope - The chromatic aberrations, Telescope - Famous optical telescopes, Telescope - Related lists Read more here: » Telescope: Encyclopedia II - Telescope - History |
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| | | | | refracting telescope: Encyclopedia II - Telescope - Telescope mountings A simple telescope mount is an altitude-azimuth or altazimuth mount. It is similar to that of a surveying transit. A fork rotates in azimuth (in the horizontal plane), and bearings on the tips of the fork allow the telescope to vary in altitude (in a vertical plane). A Dobsonian mount is a type of altazimuth mount which has proven to be very popular as it is simple and inexpensive.
When using an altazimuth for astronomy, both axes must be continuously adjusted to compensate for the Earth's rotation. Even if this i ...
See also:Telescope, Telescope - History, Telescope - Types, Telescope - Telescope mountings, Telescope - Research telescopes, Telescope - Imperfect images, Telescope - The five Seidel aberrations, Telescope - The chromatic aberrations, Telescope - Famous optical telescopes, Telescope - Related lists Read more here: » Telescope: Encyclopedia II - Telescope - Telescope mountings |
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| | | | | refracting telescope: Encyclopedia II - Telescope - Telescope mountings A simple telescope mount is an altitude-azimuth or altazimuth mount. It is similar to that of a surveying transit. A fork rotates in azimuth (in the horizontal plane), and bearings on the tips of the fork allow the telescope to vary in altitude (in a vertical plane). A dobsonian mount is a type of altazimuth mount which has proven to be very popular as it is simple and cheap to make.
The major problem with using an altazimuth for astronomy is that both axes must be continuously adjusted to compensate for the Earth ...
See also:Telescope, Telescope - History, Telescope - Types, Telescope - Telescope mountings, Telescope - Research telescopes, Telescope - Imperfect images, Telescope - The five Seidel aberrations, Telescope - The chromatic aberrations, Telescope - Famous optical telescopes, Telescope - Related lists Read more here: » Telescope: Encyclopedia II - Telescope - Telescope mountings |
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| | | | | refracting telescope: Encyclopedia II - Telescope - Research telescopes Most large research telescopes can operate as either a Cassegrain telescope (longer focal length, and a narrower field with higher magnification) or a Newtonian telescope (brighter field). They have a pierced primary mirror, a Newtonian focus, and a spider to mount a variety of replaceable secondary mirrors.
A new era of telescope making was inaugurated by the Multiple Mirror Telescope (MMT), with a mirror composed of six segments synthesizing a mirror of 4.5 meters diameter. This has now been replaced by a single 6.5m mirror. Its example was followed by ...
See also:Telescope, Telescope - History, Telescope - Types, Telescope - Telescope mountings, Telescope - Research telescopes, Telescope - Imperfect images, Telescope - The five Seidel aberrations, Telescope - The chromatic aberrations, Telescope - Famous optical telescopes, Telescope - Related lists Read more here: » Telescope: Encyclopedia II - Telescope - Research telescopes |
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| | | | | refracting telescope: Encyclopedia II - Telescope - Research telescopes Most large research telescopes can operate as either a cassegrain telescope (longer focal length, and a narrower field with higher magnification) or newtonian telescope (brighter field). They have a pierced primary, a newtonian focus, and a spider to mount a variety of replaceable secondaries.
A new era of telescope making was inaugurated by the MMT, with a mirror composed of six segments synthesizing a mirror of 4.5 metres diameter (this has now been replaced by a single 6.5m mirror). Its example was followed by ...
See also:Telescope, Telescope - History, Telescope - Types, Telescope - Telescope mountings, Telescope - Research telescopes, Telescope - Imperfect images, Telescope - The five Seidel aberrations, Telescope - The chromatic aberrations, Telescope - Famous optical telescopes, Telescope - Related lists Read more here: » Telescope: Encyclopedia II - Telescope - Research telescopes |
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| | | | | refracting telescope: Encyclopedia II - Herbig-Haro object - Discovery and history of observations The first Herbig-Haro object was observed in the late 19th century by Burnham, when he looked at the star T Tauri with the 36-inch refracting telescope at Lick Observatory and noted a small patch of nebulosity nearby. However, it was catalogued merely as an emission nebula, later becoming known as Burnham's Nebula, and was not recognised as a distinct class of object. However, T Tauri was found to be a very young and variable star, and is the prototype of the class of similar objects known as T Tauri stars which have yet to reach a state of equilibrium between gravitati ...
See also:Herbig-Haro object, Herbig-Haro object - Discovery and history of observations, Herbig-Haro object - Physical characteristics, Herbig-Haro object - Numbers and distribution, Herbig-Haro object - Proper motions and variability, Herbig-Haro object - Source stars Read more here: » Herbig-Haro object: Encyclopedia II - Herbig-Haro object - Discovery and history of observations |
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| | | | | | | refracting telescope: Encyclopedia II - Reflecting telescope - Reflecting telescope designs
Reflecting telescope - Schmidt camera.
The Schmidt camera, invented by Bernhard Schmidt, is not technically a telescope since the light path does not exit to an eyepiece. Therefore it is strictly a camera, with a photographic plate, film or a CCD placed at the prime focus. The Schmidt camera corrects for spherical aberration by placing a correcting lens at the center of curvature of the mirror. The corrector, which is thicker in the middle and the edges, corrects the light paths so that the outer and inner parts ...
See also:Reflecting telescope, Reflecting telescope - Technical considerations, Reflecting telescope - Reflecting telescope designs, Reflecting telescope - Schmidt camera, Reflecting telescope - Newtonian focus, Reflecting telescope - Cassegrain focus, Reflecting telescope - Focal planes, Reflecting telescope - Prime focus, Reflecting telescope - Coudé focus Read more here: » Reflecting telescope: Encyclopedia II - Reflecting telescope - Reflecting telescope designs |
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| | | | | refracting telescope: Encyclopedia II - Reflecting telescope - Reflecting telescope designs
Reflecting telescope - Newtonian focus.
The Newtonian usually has a paraboloid primary mirror but for small apertures, say 12cm or less, if the focal ratio is f/8 or longer a spherical primary mirror is sufficient for high visual resolution. A flat secondary mirror reflects the light to a focal plane at the side of the top of the telescope tube. It is one of the simplest and least expensive designs for a given size of primary, and is popular with amateurs as a home-build project. Since the light path is un ...
See also:Reflecting telescope, Reflecting telescope - Technical considerations, Reflecting telescope - Reflecting telescope designs, Reflecting telescope - Newtonian focus, Reflecting telescope - Cassegrain focus, Reflecting telescope - Schmidt camera, Reflecting telescope - Focal planes, Reflecting telescope - Prime focus, Reflecting telescope - Coudé focus Read more here: » Reflecting telescope: Encyclopedia II - Reflecting telescope - Reflecting telescope designs |
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