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Topic: Reflecting telescope

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Spherical aberration

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	Isaac Newton - MSN Encarta
		He established the modern study of optics—or the behavior of light—and built the first reflecting telescope.
		His earlier experiments with the prism convinced him that a telescope’s resolution is limited not so much by the difficulty of building flawless lenses as by the general refraction differences of differently colored rays.
		Scottish mathematician James Gregory had proposed a design for a reflecting telescope in 1663, but Newton was the first scientist to build one.
	encarta.msn.com /encyclopedia_761573959/Isaac_Newton.html (1448 words)

	Telescope Fun » Reflecting Telescope
		Obviously, the larger the objective the greater is the capacity of the telescope to gather light which in turn allows the viewed image to be better visualized.
		One type of telescope is called the refractor telescope and the other is known as the reflecting telescope.
		This results in the telescope itself being larger which may prove to be an issue when storing or relocating the reflecting telescope.
	telescopes.info-blogs.com /reflecting-telescope (437 words)

	Reflecting Telescopes - InDepthInfo
		Reflecting telescopes use mirrors to gather light from distant objects.
		The reflecting telescope was invented not long after the refracting telescope (1672).
		Telescopes used for astronomy permanently situated at observatories are mounted on moving platforms to compensate for the Earth's motion.
	www.indepthinfo.com /telescopes/reflecting-telescopes.shtml (426 words)

	How does a Telescope work?
		The word telescope is derived from the Greek words tele, "from afar," and skopos, "viewer." It revealed unsuspected planets, stars and other bodies in the heavens and had a profound influence on the controversy between followers of the traditional geocentric astronomy and cosmology and those who favored the heliocentric system of Copernicus.
		The reflecting telescope focuses light rays with a large curved concave mirror that is generally made of glass covered with a thin coating of aluminum.
		Orbiting telescopes are used to observe the ultraviolet (UV) and infrared portions of the electromagnetic spectrum.
	geocities.com /wt2002friendz/schoolwork/telescope_gina_mei.html (1016 words)

	telescope. The Columbia Encyclopedia, Sixth Edition. 2001-05
		Traditional optical telescopes, which are the subject of this article, also are used to magnify objects on earth and in astronomy; other types of astronomical telescopes gather radio waves (see radio astronomy), X rays (see X-ray astronomy), or infrared or ultraviolet radiation.
		In a reflecting telescope, or reflector, light is reflected by a concave mirror and brought to a focus in front of the mirror.
		Equal in importance to the mirrors and lenses constituting the optics of a telescope is the mounting of the telescope.
	www.bartleby.com /65/te/telescop.html (1896 words)

	telescope@Everything2.com
		Herschelian telescope, a reflecting telescope of the form invented by Sir William Herschel, in which only one speculum is employed, by means of which an image of the object is formed near one side of the open end of the tube, and to this the eyeglass is applied directly.
		Reflecting telescope, a telescope in which the image is formed by a speculum or mirror (or usually by two speculums, a large one at the lower end of the telescope, and the smaller one near the open end) instead of an object glass.
		Telescope sight (Firearms), a slender telescope attached to the barrel, having cross wires in the eyepiece and used as a sight.
	www.everything2.com /index.pl?node=telescope (589 words)

	Telescope Review and Astronomy Telescope Reviews
		As astronomical telescopes have advanced over recent years, the popularity of gazing at the stars is increasing at a faster rate.
		Bushnell Telescopes are great for recreational astronomy, because they cater more to beginners, Bushnell deep space images can be easily found by amateurs because of its equatorial mount, which makes tracking objects easy.
		The Hubble telescope is famous worldwide among astronomers, it is most famous for its Hubble space pictures.
	www.best-telescope-guide.com (487 words)

	How to buy telescopes? Telescope reviews: reflecting telescopes, refracting telescope Meade Celestron Bushnell Tasco
		A reflector telescope uses a large mirror at the bottom of the telescope to focus light rays on a smaller mirror near the opening which then reflects the light into an eyepiece located at the top of the telescope.
		Reflector telescopes are more fragile than other types of telescopes and need periodic readjustment of the telescope mirrors (a process called collimation) and, because they are open on the top (Newtonian reflector), the mirrors are exposed to dust and dirt and therefore need periodic cleaning.
		When seen in the eyepiece of a telescope, stars and planets move slowly across the field of view in the eyepiece and disappear (because the telescope magnifies the earth's rotation, not because the stars move).
	www.opticsplanet.net /how-to-buy-a-telescope.html (4866 words)

	Garden Telescopes - The Porter Garden Telescope
		This elegant garden telescope was created in the early 1920s by Russell Porter, designer of the Palomar Mountain Observatory 200 inch Hale Telescope.
		Today, Telescopes of Vermont is lavishly and faithfully recreating The Porter Garden Telescope in hand-finished cast bronze, with improved 21st century optics.
		With the authorization of the Springfield Telescope Makers, founded by Porter, we are offering our garden telescope in a numbered, limited edition to discriminating buyers who are seeking a truly distinctive landscape design centerpiece.
	gardentelescopes.com (290 words)

	The Francis C. McMath Memorial 24-Inch Reflecting Telescope of the McMath-Hulbert Observatory
		Telescope clearances were carefully laid out and, except for a rearrangement of the shutter operating cables, were found to be close but adequate.
		We were particularly desirous of building a fine drive for the 24-inch telescope because we planned to use the 100-foot focal length combination a large portion of the observing time.
		Fast or rough setting of the telescope is made by releasing a friction clamp, the back of which is shown at the D, plate 4 [see below] and moving the drive arm E to the desired declination angle.
	www.umich.edu /~lowbrows/reflections/1997/mcmath.1.html (2049 words)

	World Almanac for Kids
		TELESCOPE, a lens, mirror, or other reflecting surface used to form an image of a distant object, together with a microscope, for the observer, a photographic camera, or some form of spectroscopic apparatus.
		The mirrors for reflecting telescopes were usually made of speculum metal, a mixture of copper and tin, until the German chemist Baron Justus von Liebig discovered the method of depositing a film of silver on a glass surface.
		In England, telescopes were mounted by having the polar axis supported at each end, but the German system, in which the mounting is in the center and the weight of the telescope is balanced by counterpoises, is not generally used for large refractors, and a modified form is employed for reflectors.
	www.worldalmanacforkids.com /explore/space/telescope.html (1180 words)

	Meade Instruments Corporation - How Telescopes Work
		In the 2" telescope Jupiter's largest cloud belts are clearly observable; but in the 4" telescope the same cloud belts are seen to take on added structure and color, and smaller cloud belts are now visible that could not be discerned in the smaller instrument.
		With the telescope's primary optics (objective lens, primary mirror, or a combination of lenses and mirrors) having formed an image at the telescope's focus, the purpose of the eyepiece (consisting of two or more small lenses mounted in a metal barrel) is to magnify this image.
		Telescopes are said to be of high-resolution if they are manufactured to optical standards that permit a level of visible detail consistent with the aperture and optical design of the instrument.
	www.meade.com /support/telewrk.html (1750 words)

	Telescope Basics
		He made refracting telescopes which consisted of a positive or magnifying lens as the main lens or objective, and an eyepiece which was a single negative or minifying lens as an eyepiece.
		This type of telescope has a very small field of view however, and this telescope design has mostly fallen from favor, although it is an interesting project to construct one and try to duplicate Galileo's observations.
		Reflecting telescopes are often described by the diameter of their primary mirror followed by their focal ratio.
	telescopemaking.org /basics.html (1246 words)

	Reflecting Telescope (Site not responding. Last check: )
		Also, the telescope tube of a reflector is shorter than that of a refractor of the same diameter, which reduces the cost of the tube.
		Some large telescopes of this kind do not have a hole in the primary mirror but use a small plane mirror in front of the primary to reflect the light outside the main tube and provide another place for observation.
		Most large reflecting telescopes that are currently in use have a cage at their prime focus that permits the observer to sit inside the telescope tube while operating the instrument.
	abyss.uoregon.edu /~js/glossary/reflecting_telescope.html (624 words)

	Telescopes: reflecting, refracting and catadioptric telescopes.
		The image at the telescope's focus is brighter than the original image falling on the telescope's mirror (reflector) or lens (refractor) by the number of times the area of the mirror or lens exceeds the area of the focused image.
		Whereas a telescope can make an image millions (or, with time exposure and a CCD, billions) of times brighter, it is often only magnified 50 to a few hundred times because it was originally very faint but not that small.
		© Carl Woebcke: Telescopes, reflecting, refracting and catadioptric, 1991-2007.
	www.myastrologybook.com /Telescopes-reflecting-refracting-catadioptric.htm (911 words)

	Equatorial mount for a binocular reflecting telescope - Patent 5537250
		The light reflected by the primary mirrors 110, 110' is reflected again by the secondary mirrors 112, 112' for condensing, passed thorough the small holes 111, 111' reflected by the Porro prisms 113, 113' and guided to eyepieces 114, 114'.
		With the binocular reflecting telescope according to the first embodiment, the light emitted from afar and coming into the front end of each primary barrel is reflected by the concave and convex surfaces of the primary mirror and the secondary mirror.
		With the binocular reflecting telescope according to the present invention, light is guided out of the primary optical axis from the point between the primary mirror and the secondary mirror and the inverted image is converted into an erect real image by means of the erect real image forming means.
	www.freepatentsonline.com /5537250.html (6344 words)

	Exploratorium: Hubble: Before Hubble
		The larger the light-collecting component, the greater the telescope's light-gathering ability and, therefore, its "resolving power." Resolving power is the ability of the telescope to show two adjacent objects, such as "double" stars or a planet and its moon, as separate, distinct images.
		The Hubble Space Telescope (HST) is a large reflecting telescope that was designed by NASA to be a space-based observatory with a life expectancy of about fifteen years.
		Hubble is a reflecting telescope with a primary mirror that is 2.4 meters (94.5 inches) wide, smaller than the largest observatory telescopes.
	www.exploratorium.edu /origins/hubble/tools/before.html (945 words)

	Telescopes.com: Shop Telescopes and Telescope Eyepieces
		Advanced search: Telescopes Shopping Wizard Call the experts at 1-800-303-5873
		Telescopes.com: The leading source for telescopes and telescope accessories
		Telescopes.com brings you the largest selection of the finest Telescopes and Telescope Accessories at prices that fit most any budget.
	www.telescopes.com (166 words)

	Refracting and Reflecting Telescopes
		Refracting telescopes have two main problems—images are not always clear because the light is being bent and the size of the lens is limited (which limits the power of the telescope).
		Reflecting telescopes use curved mirrors instead of convex lenses to collect and focus light.
		Reflecting telescopes are very helpful for viewing dim or dark objects.
	library.thinkquest.org /J0112188/refracting_and_reflecting_telescopes.htm (433 words)

	the @stro pages - @stro objects archive - Newtonian Reflecting Telescope
		The Newtonian reflecting telescope is probably the most common visual telescope type in use today.
		Invented by Sir Isaac Newton about 400 years ago, the Newtonian telescope works by collecting light on a large "primary mirror" which is then reflected it back to a smaller mirror that finally bounces the image back into an eyepiece where the user focuses the image.
		A reflecting telescope offers several advantages over another commonly used visual telescope, the refractor (which uses lenses instead of mirrors to collect and focus light).
	theastropages.com /astroobjects/2000/20000103.htm (174 words)

	FreddyReyes.Com - Meade Model 4500 Reflecting Telescope (User Manual) (Site not responding. Last check: )
		The power at which a telescope is operating is determined by the eyepiece employed; all Meade telescopes include one or more eyepieces as standard equipment, and optional eyepieces are available for higher or lower powers.
		The effect of the telescope's magnification is to greatly speed up this apparent motion, to the point where, without operation of the telescope's tracking controls, objects quickly (within 10 to 30 seconds) move out of the telescopic field of view.
		The power, or magnification of the telescope depends on two optical characteristics: the focal length of the main telescope and the focal length of the eyepiece used during a particular observation.
	freddyreyes.com /index.php?option=com_content&task=view&id=40 (5061 words)

	NMAH \| Odyssey 1 Dobsonian Reflecting Telescope
		Unfortunately, to actually see these astronomical objects required large telescopes that were generally only available to astronomers and were too expensive for average people, and especially for Dobson, who had taken a vow of poverty.
		Compared to the typical amateur telescope of the time, what came to be known as the "Dobsonian" telescopes were large, easy to use, inexpensive, and portable.
		Telescope design continues to evolve and today the majority of amateur telescopes (like this one) are precise and commercially made.
	americanhistory.si.edu /collections/object.cfm?key=35&objkey=217 (326 words)

	Telescope
		Remember that reflecting telescopes originally developed to solve the problem of colour distortions caused by lenses bending light at different angles.
		The dish is the same shape as the mirror of a reflecting telescope.
		Radio telescopes are a valuable tool for astronomers since many objects in the universe do not produce enough visible light to be picked up by optical telescopes.
	www.yesmag.bc.ca /how_work/telescope.html (1130 words)

	First Reflecting Telescope, and other First Reflecting Telescope information (Site not responding. Last check: )
		There are three types of telescopes: refractors, reflectors (which some people also call a "reflecting telescope") and compound or "catadioptric" scopes.
		Reflecting Telescopes use a mirror to gather light and bring the image to the eyepiece.
		A reflecting telescope (reflector) is an optical telescope which uses mirrors, rather than lenses, to...
	www.maxiscopes.co.uk /directory/first-reflecting-telescope.html (386 words)

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