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Topic: Refractor telescope

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	Starizona's Telescope Basics
		In fact, all telescopes were refractors until Isaac Newton invented the first reflecting telescope in 1669, six decades after Galileo first pointed his telescope to the heavens.
		Refractors gather light by using an objective lens located at the front (skyward) end of the telescope.
		This makes refractors well-suited as multi-purpose telescopes for both terrestrial observing and stargazing, unlike Newtonian reflectors which produce inverted images and are only suited for astronomical observing.
	starizona.com /acb/basics/equip_telescopes_refractors.aspx (1441 words)

	Refracting telescope - Wikipedia, the free encyclopedia
		A refracting or refractor telescope is a type of optical telescope which refracts light at each end using lenses.
		Refractors are criticized for their relatively high-degree of chromatic and spherical aberration.
		Such telescopes contain elements of fluorite in the objective elements and produce a very crisp image which is virtually color aberration free.
	en.wikipedia.org /wiki/Refractor_telescope (314 words)

	Refractor telescope (Site not responding. Last check: 2007-11-03)
		The 28-inch Photo-visual Refractor Exhibition from the Royal Observatory, Greenwich, that explains the history of this telescope via words and archive photographs.
		The solar telescope THÉMIS THÉMIS [Heliographic Telescope for the Study of the Magnetism and Instabilities on the Sun] is a new generation solar telescope built by the INSU/CNRS (France) and the CNR (Italy) agencies.
		James Webb Space Telescope [Space Telescope Science Institute site] A key part of the NASA Origins Program, is designed to be the successor to the Hubble Space Telescope.
	www.serebella.com /encyclopedia/article-Refractor_telescope.html (379 words)

	Celestron -- Telescope Basics
		Choosing a particular telescope depends on your individual needs including cost, portability, versatility, usability, appearance, etc. You should also contemplate what you plan to do with the instrument both now and in the future.
		Some amateur astronomers build their own telescopes but this market has rapidly declined due to the abundance of affordable commercial telescopes available and the time, materials and equipment needed to hand-construct an instrument.
		Refractors (also known as dioptrics) are what the average person identifies with the word "telescope", a long, thin tube where light passes in a straight line from the front objective lens directly to the eyepiece at the opposite end of the tube.
	www.celestron.com /tb-2ref.htm (878 words)

	Short Tube Refractor Telescope
		Whether they are to be used as a beginner's telescope, a "rich-field", a backup, a guide scope or a travelling telescope, the very reasonable prices make them choices to seriously consider.
		Mounting one of these telescopes on the supplied aluminum alt-azimuth mount or a photographic tripod is quick and simple with the supplied "multi-function mount plate".
		Mounting the telescope on an alt-azimuth or an equatorial mount is quick and simple with the appropriate mounting plate.
	camera-traders.com /sky-watcher/short_tube_refractor.htm (701 words)

	General dictionary - Telescope
		There are two basic types of telescopes, refractors and reflectors, whether the magnification is based upon refraction or reflection (see optical laws).
		Today, excellent small refractors are still made for amateur telescopes, but the disadvantages of this kind of instrument have stopped the construction of very large refractors for use in astronomical research.
		Because of these disadvantages, the largest refractor telescope built is the one at Yerkes Observatory, with an objective 1.02 meters across at one end of a 19.2 meter tube.
	spaceguard.rm.iasf.cnr.it /tumblingstone/dictionary/telescope.htm (698 words)

	Preliminary Things for Making a Refractor Telescope. (Site not responding. Last check: 2007-11-03)
		It is very important that you should have a clear grasp of what you are undertaking and how a basic telescope lens works, because lenses are more complicated and perform more functions than paraboloidal mirrors.
		Another highly useful book is "The Adjustment and Testing of Telescope Objectives," by H. Dennis Taylor, first published in 1891 and recently reissued by Willmann-Bell Publishers.
		One reason why ATMs shy away from building refractors is that generally some different special equipment is needed than what is needed to make a Newtonian reflector.
	www.atmsite.org /contrib/Ceragioli/refractor/Refrprelim.htm (472 words)

	Dick Parker's Telescope Mirror Workshop: Refractor Telescope Project
		That was a good refractor lens that could be built by a moderately experienced person under the guidance of the workshop environment.
		For testing refractors the flat does not have to be aluminized nor does it need to be perforated in the center.
		Also, refractors are designed to minimize spherical aberration at a light color for its intended use.
	www.mtbparker.com /MirrorWorkshop/refractorStory.html (1766 words)

	8 inch refractor telescope (Site not responding. Last check: 2007-11-03)
		The telescopes, an 8 inch refractor and a 16 inch reflector, are each housed in a seperate interconnecting dome.
		The 16 inch telescope is mainly used by undergraduate astronomy students while the 8 inch telescope is used by first year astronomy students and for the public tour nights.
		The telescope has an achromatic objective lens with a diameter of 200 mm and a focal length of 3000 mm.
	www.astro.utoronto.ca /~barkhous/refractor.html (127 words)

	Science Optical Telescope/Refractor
		Specifications: A refractor telescope uses lenses at each end to bend light and form an image.
		Specifications: A refractor type telescope designed for rugged, trouble free, and easy operation.
		Specifications: The telescope is fitted with an Altitude (Alt)-Azimuth mount.
	www.hobbylinc.com /prods/xmd.htm (163 words)

	Bushnell Deep Space 420x 60mm Refractor Telescope (Site not responding. Last check: 2007-11-03)
		The highest magnification this telescope can realistically provide under the best of viewing conditions is about 50-60x per inch of aperture, or 120-140 power in this case.
		A much better choice for a first scope would be a 4-inch dobsonian mounted reflecting telescope, available for just a few more dollars; you DO get what you pay for.
		Celestron makes some of the world's greatest telescopes, but this is not one of them.
	www.freeglossary.com /p:B00005AXJ2 (257 words)

	Digital & Film Camera Store - Celestron C102HD 102mm Refractor Telescope
		Wish to say this is indeed a wonderful value telescope, looking forward to planetary sessions which this unit will surely excell, also the brighter deep sky objects will keep you busy.
		This is not a highly portable telescope as is the ETX, but you can muscle the 40 plus pounds fully assembled short distances, very reason I personally like the smaller scopes, but the 4 inch adds more muscle in aperture as well.
		This is one of the refractor`s most superior features and is one of the main reasons why they often make better planetary scopes than other types of scopes much larger.
	www.shoppingcamera.com /review/optics-telescopes-refractors/B000051TIA/celestron-c102hd-102mm-refractor-telescope-discount/499152.html (2325 words)

	Zhumell Kepler 152mm Refractor Telescope - Telescopes - Telescopes4kids.com
		Zhumell Kepler 152mm Refractor Telescope - Telescopes - Telescopes4kids.com
		Telescopes » Zhumell » Kepler 152mm Refractor Telescope
		By recognizing that planets moved in an elliptical orbit and developing an optical system on which today's refractor telescopes are still based, Kepler allowed generations of astronomers to closely study the planets of our solar system.
	telescopes4kids.com /products/Zhumell_Kepler_152mm_Refractor_Telescope_27617.html (324 words)

	BSA Optices 150X Refractor Telescope (Site not responding. Last check: 2007-11-03)
		A quality entry 150X magnification level telescope which is quick and easy to set up.
		The telescope is fitted with a tripod and an easy to use alt-azimuth mount giving the unit up/down and lateral movement, combined with a slow motion elevation adjustment.
		The telescope is supplied complete with adjustable lightweight legs.
	www.letoy.co.uk /bsa150x.htm (107 words)

	Chabot Space & Science Center Observatories
		The impressive 20" telescope, named Rachel, is the largest refractor in the western United States regularly open to the public.
		Telescope viewing this winter will be spectacular with Saturn at its closest to Earth in over 30 years.
		Through a telescope its rings are as wide as they get as we view its southern hemisphere.
	www.chabotspace.org /visit/observatories.asp (448 words)

	Draco Productions Refractor Telescopes and Refractor Telescope Kits (Site not responding. Last check: 2007-11-03)
		This telescope uses low enough power to enable it to be used as a hand-held instrument, but it comes pre-drilled for camera tripod mounting, as well.
		An example of a finished copier lens telescope along with directions for construction may be seen at: http://www.eaaa.net/copier_lens_telescope.htm.
		If you are planning to use a home-built telescope as part of a Science Fair or school project, please check with your teacher or advisor before purchasing the unit.
	www.dracoproductions.net /refractor_telescope.htm (645 words)

	Company Seven \| Orion 80mm ED Apochromat Refractor Telescope
		This telescope has become so well regarded for its balance of performance and value in its class that we hoped the design would be scaled up to produce a telescope with a larger aperture, one that would be even better suited for astronomical applications.
		And finally on 6 August 2004 this new telescope was introduced to the world at Company Seven as the 100mm ED telescope.
		Telescopes such as this often put the eyepiece at position that is only about 3 or 4 feet (0.9 or 1.2 meters) from the ground.
	www.company7.com /orion/telescopes/orion80EDf7.5.html (4325 words)

	Folded Refractor Telescope
		My telescope requires cooling for a few minutes when it experiences a 40 or 50 degree change in temperature.
		The finder for my telescope is an ordinary 8x50 mounted inside an Oak box to be harmonious with the appearance of the main telescope.
		And the result is a telescope that costs about half as much as an APO and performs as well or better.
	hometown.aol.com /davetrott/page10.htm (350 words)

	Telescope News refractor telescope for sale (Site not responding. Last check: 2007-11-03)
		Sometimes when you're trying to find better advice about refractor telescope for sale, you'll find it's complex seperating superior advice from unadvised refractor telescope for sale suggestions and directions so it is sensible to know how to judge the information you are presented with.
		Here's a few tips that we believe you should think of using when you are searching for info about refractor telescope for sale.
		All decent sites giving you info on refractor telescope for sale, will almost always provide an about or contact page which will list the people behind the site The fine points should detail some key points on the owners knowledge.
	www.telescope-news.info /refractor-telescope-for-sale.htm (170 words)

	refractor telescope (Site not responding. Last check: 2007-11-03)
		Sometimes when you're trying to find superior information on refractor telescope, it will be intricate seperating value-packed advice from inexpert refractor telescope suggestions or help so it is important to know how to judge the information you are presented with.
		Here are several guidelines that we think you should use when you are searching for info about refractor telescope.
		All decent sites giving you info on refractor telescope, will nearly always have a contact, or an about, page which will list the people behind the site The details should tell you a number of key indications about the site owners expertise.
	www.telescopic-telescopes.com /refractor_telescope.htm (155 words)

	Amazon.com: Meade Telestar NGC-60A Achromatic Refractor Telescope: Electronics (Site not responding. Last check: 2007-11-03)
		Refractors (also known as dioptrics) capture light with a lens at the front of a long tube and send it to an eyepiece at the other end.
		But the fact remains that a telescope is only as good as its optics, and this is a low-end model.
		In an amateur telescope, most celestial objects are dim smudges whose vague glow is barely visible against the sky background.
	www.amazon.com /Meade-Telestar-Achromatic-Refractor-Telescope/dp/B000077VWY (1713 words)

	Telescope News refractor telescope (Site not responding. Last check: 2007-11-03)
		Sometimes when you're trying to find top information on refractor telescope, it'll be complex extricating superior advice from ill-equiped refractor telescope proposals and support so it is wise to know how to moderate the advice you are presented with.
		It is important to remember that the guidance we give is only relevant to internet information about refractor telescope.
		All reputable sites providing information about refractor telescope, will almost certainly provide an about webpage which will list the people behind the site The details should tell you some key points about the owners expertise This enables you to make an assessment about the vendors qualifications, to offer recommendations on refractor telescope.
	www.telescope-news.info /refractor-telescope.htm (155 words)

	Digital & Film Camera Store - Celestron Firstscope 70EQ 70mm Refractor Telescope
		Each telescope has its own design characteristics to help you choose which is best for you.
		If you want a dual-purpose telescope appropriate for both terrestrial and celestial viewing, then the refractor models are for you.
		Refractors produce bright, clear images of the moon and planets as well.
	www.shoppingcamera.com /review/optics-telescopes/B000051TMZ/celestron-firstscope-70eq-70mm-refractor-telescope-discount/281063.html (1202 words)

	BUYING A TELESCOPE
		In a refractor, the light from a star is collected by a lens (object glass) and brought to focus.
		With a refractor try to go for a large aperture - that is to say, the diameter of the (front) object glass, which is the light collector.
		A bad telescope does not always betray itself at first sight, and this applies to new telescopes as well as second-hand ones.
	www.geocities.com /goarana668/scope.htm (901 words)

	Refractor Telescope - compare prices, reviews and buy at NexTag - Price - Review
		With this powerful 700mm refractor telescope, curious astronomers can explore the faraway wonders of the universe from the craters of the moon to Saturns dazzling rings even...
		Tasco 100x50mm Astronomical Refractor Telescope 301051N Easy set-up makes this an inexpensive refractor telescope excellent for children and gift giving.
		An inspired combination of precision engineering, advanced electronics, exceptional optics, and a computerized database of 4,000 night-sky objects, the 80GT is one of the most...
	www.nextag.com /serv/main/buyer/OutPDir.jsp?search=refractor+telescope (245 words)

	Telescopes
		The glass lens is at the front of the telescope and light is bent (refracted) as it passes through the lens.
		The mirror is close to the rear of the telescope and light is bounced off (reflected) as it strikes the mirror.
		Though excellent refractors are still made, the disadvantages of the refractor telescope have blocked the construction of very large refractors for use in astronomical research.
	www.astronomynotes.com /telescop/s2.htm (578 words)

	Orion Observer 70mm Refractor Telescope
		This 70mm f/10 telescope has a light grasp of 5.9 square inches, 100 times the light of the unaided human eye and 36% more light than a 60mm reflector telescope.
		Many low-priced telescopes boast magnification of over 500x, which is totally unusable for three reasons.
		The maximum theoretical magnification is 120x for a 60mm telescope and 228x for a 114mm telescope.
	www.hometrainingtools.com /catalog/earth-space-science/telescopes-accessories/p_as-t070ref.html (450 words)

	21086 Celestron Firstscope 80 EQ 80mm Refractor Telescope.
		Refractor telescopes have a long, thin tube in which light passes in a straight line from the front objective lens directly to the eyepiece, at the opposite end of the tube.
		Celestron's 80mm refractor is a top choice for beginning observers who want to start with a more powerful telescope and for intermediate level astronomers.
		A telescope on an equatorial mount can be aimed at a celestial object and guided with the slow motion controls to follow the object across the sky and keep it in the field of view of your telescope.
	www.adorama.com /CNF80EQ.html (479 words)

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