
	Where results make sense

Topic: Newtonian telescope

Related Topics

Reflector telescope

Reflecting telescope

Amateur telescope making

Optical telescope

Focal length

Telescope

Cassegrain telescope

Collimated light

List of telescope types

Refracting telescope

Telescope mount

Dobsonian

Parabolic reflector

Chromatic aberration

Sextant

In the News (Fri 27 Nov 09)

Northern Trust

Marvin Harrison

Peter Chernin

Gary Locke

Match Play

Penelope Cruz

Mickey Rourke

AR Rahman

Danny Boyle

Hugh Jackman

	Collimating a Newtonian Reflecting Telescope
		After assembling the components of the telescope in the tube, it is necessary collimate (align) the optical componets from best performance.
		Point the telescope toward an evenly illuminated area such as a light colored wall or the day-time sky.
		The telescope is now collimated well enough to form an acceptable image, however in order to utilize the best performacne possible the following adjustments on a start must be made.
	www.weertman.com /bruce/atm/collimate (563 words)

	Newtonian telescope - Wikipedia, the free encyclopedia
		The Newtonian telescope is a type of reflecting telescope invented by the British scientist Sir Isaac Newton (1643-1727), using a parabolic primary mirror and a flat diagonal secondary mirror.
		This flare is zero on-axis, and is linear with increasing field angle and inversely proportional to the square of the mirror focal ratio, equal to the mirror focal length divided by the mirror aperture.
		Newtonians with a focal ratio of f/6 or higher are considered to have insignificant coma for visual or photographic use.
	en.wikipedia.org /wiki/Newtonian_telescope (540 words)

	Making a Newtonian Telescope
		Newtonian and catadioptric telescopes have secondary (or diagonal) mirrors that obstruct a small percentage of light from the primary mirror.
		The exit pupil of a telescope is the circular beam of light that leaves the eyepiece being used and is measured in mm.
		This is the ratio of the focal length of the telescope to its aperture.
	www.altair.org /bluenewt.html (4559 words)

	Telescope Buying Tips
		This measurement is the diameter of the primary mirror or lens, not the tube of the telescope.
		Newtonian reflectors use a large mirror at the back of the telescope to gather light, which is reflected back up towards the front of the telescope.
		Telescopes of this design are basically the same as Schmitt Cassegrains except their corrector plate is curved which allows greater contrast and a flatter field.
	www.andrewfazekas.com /scopebuyers.htm (997 words)

	About Coma
		The dominant optical aberration in the Newtonian telescope is off-axis coma.
		The amount of coma apparent in a Newtonian telescope is a function of the focal ratio of the telescope.
		The surface of a Newtonian telescope’s primary mirror is parabolic.
	www.opticalmechanics.com /about_coma.htm (1924 words)

	N.A.A.'s "How Telescopes Work" Guide
		The main function of the telescope is to gather a large bundle of incoming light rays, condense it down, and re-focus it to send it into the eye as a smaller (brighter) beam of once-again parallel rays.
		Obviously, the larger the diameter of the telescope's Objective (main lens or mirror) is, the brighter the star image will be; also, larger diameters allow fainter stars to be viewed (by gathering enough of their sparse rays for the eye to detect them).
		This is easily achieved with a telescope; by adjusting the focus of the Eyepiece (generally its in and out position), the alignment of the light rays is varied, and near-sightedness or far-sightedness can easily be corrected for with the twist of a knob.
	www.stargazing.net /naa/scope2.htm (1804 words)

	FAQ about Collimating a Newtonian telescope
		If you move your telescope to darker skies and back, and particularly if you have one with truss tubes that you assemble and disassemble, you must be able to check the collimation each night out, and you must be able to tweak it whenever needed.
		Even if your telescope was factory collimated before shipping, it may have been on its longest journey ever before it reached you, and chances are great that it has lost much of its collimation.
		There are two optical axes in a Newtonian telescope: the optical axis of the main mirror, and the optical axis of the eyepiece.
	www.atmsite.org /contrib/Carlin/collimation (7809 words)

	FAQ about Collimating a Newtonian telescope
		If you move your telescope to darker skies and back, and particularly if you have one with truss tubes that you assemble and disassemble, you must be able to check the collimation each night out, and you must be able to tweak it whenever needed.
		There are two optical axes in a Newtonian telescope: the optical axis of the primary mirror, and the optical axis of the eyepiece.
		In a "fast" f/4.5 telescope with high magnification, giving an exit pupil of 0.5 mm (this is 50x per inch of aperture, a reasonable upper limit at least for small telescopes), an eyepiece of "standard" field (some 50 deg apparent) has a true field of approximately 2 mm, the same size as the "sweet spot".
	web.telia.com /~u41105032/kolli/kolli.html (8850 words)

	Telescope Making..!
		The 6-inch f/8 Newtonian reflecting telescope is probably the most popular star gazing instrument in use by the amateur astronomers.This is easily understood when we examine the instrument in more detail.
		The figure "f/8" is an optical expression derived from the ratio between the focal length and the diameter of the telescope mirror.
		The name "Newtonian" refers to the over-all design of this type of reflecting telescope in which ray from the objective or main mirror are focused onto a smaller mirror mirror known as the "diagonal".The diagonal is set further up in the telescope tube at a 45 degree angle to the main mirror and the eyepiece.
	www.geocities.com /yatheen/Tele (654 words)

	Company Seven \| Orion Argonaut™ 6" Maksutov-Newtonian Telescope
		The Orion Argonaut™ 6" (15cm) Maksutov-Newtonian is a telescope for astronomers who seek the best possible view in terms of contrast, and clarity of the planets, the moon, the sun and the brighter deep Sky objects while on a constrained budget.
		The effective focal length of the telescope, and the overall physical length of the Mak-Newt telescope are about that of the focal length of the Primary Mirror.
		Telescopes such as this often put the eyepiece at position that is eay for most people to reach while sitting or standing.
	www.company7.com /orion/catadioptric/argo6.html (2311 words)

	Michael Fallwell
		Many people assume that since the Newtonian is such a simple and popular design that all its variants have been fully exploited.
		The Folded Newtonian is actually a radical departure from accepted design resulting in huge cost and performance advantages.
		On a 40 inch f: 8 the 8 ft. long back focus allows the focal plane to be brought into a rotating room, isolating the telescope from the heat of the equipment.
	www.johanneswilm.org /mike/telescope (859 words)

	Top Ten Ways of Improving Newtonian Telescope Optics
		The Newtonian has a single curved mirror as the focusing element, and is the most common type of telescope among amateurs.
		Telescope makers can use a variety of techniques, but ordinary telescope users find that learning a workshop method is difficult.
		The worst portion of the average Newtonian telescope mirror is the edge.
	home.digitalexp.com /~suiterhr/TM/Topten.htm (1007 words)

	Newtonian telescope
		One of the simplest kinds of reflecting telescope, popular with amateurs because of its effectiveness and relatively low cost.
		It uses a parabolic primary mirror to focus an image onto a flat diagonal, which, in turn, reflects the image to a side-mounted eyepiece near the top of the tube.
		The Newtonian overcame the problem of chromatic aberration that blighted early refractors but can itself be affected by coma at focal ratios of less than f/3.
	www.daviddarling.info /encyclopedia/N/Newtonian_telescope.html (145 words)

	Company Seven \| Orion Atlas™ 10" Equatorial Newtonian Reflecting Telescope
		The Primary mirror of the telescope is precisely mounted in a Cell at the rear of the telescope.
		The light entering the telescope is gathered and then reflects forward in a converging beam, to the Secondary Mirror that is positioned near the front of the telescope.
		Among the considerations of a reflecting telescope is that the mirrors be precisely positioned within the OTA in terms of centering, tilt, and spacing.
	www.company7.com /orion/telescopes/orion10f4.9atlas.html (4580 words)

	Vanns.com: Celestron First Scope 114EQ Short 114mm (4.5") Newtonian Reflector Telescope (First Scope 114EQ Short) ...
		A Newtonian reflector telescope design uses a single concave mirror, instead of an objective lens as in a refractor, as its primary optical element.
		Newtonian reflectors are excellent for viewing faint, deep-sky objects like remote galaxies, nebulae, and star clusters because of their generally fast focal ratios.
		Newtonian reflectors are best for astronomical observation where image orientation is not important.
	www.vanns.com /shop/servlet/item/features/411150615 (584 words)

	Lurie-Houghton Telescope Design - an Astronomy Net Article
		The Newtonian telescope uses a paraboloidal mirror at the back end of the telescope tube to reflect and focus the light.
		Most commercial telescope vendors will state their telescopes are diffraction limited, but they don't state over what field of view.
		The central obstruction that is normally present in reflecting type telescope is there because some type of mirror is needed to reflect the light from the primary mirror to the eyepiece.
	www.astronomy.net /articles/17 (2217 words)

	Newtonian Telescope
		They were not large, as we know telescopes today, the effective apertures of the concave specula being about 1 1/3".
		6The (f/ number of a telescope mirror or lens is the ratio of its focal length to its diameter.
		As with the compound telescopes, the primary mirror must be a paraboloid, since a spherical surface cannot reflect parallel rays, such as those from a star, to a single
	www.best-telescope-guide.com /7newtoniantelescope.html (607 words)

	Newtonian Telescope Information (Site not responding. Last check: 2007-09-17)
		Konusky 200 Newtonian Telescope Designed to give the best to the most demanding observers, this telescope combines maximum power and exceptional luminosity.
		Telescope types, accessories, power, reviews, and Newtonian Telescope options for viewing of all kinds.
		FAQ about Collimating a Newtonian telescope by Nils Olof Carlin (last updated March 2005, with a revised comment on the autocollimator, and June 2005, with a revised section on the 1B error.
	telescope.imess.info /oj/newtonian-telescope.html (261 words)

	Vanns.com: Meade DS2130ATS Newtonian Reflector Telescope, 130 mm (5.1"), Computer Controlled, Short Tube (DS-2130ATS) ...
		This telescope is not only a high-resolution visual observing instrument but also is fully qualified for the more advanced areas of astronomy, including long-exposure CCD-imaging and astrophotography.
		All Meade Digital Series telescopes resolve to the theoretical limits of their respective apertures, which is a fancy way of saying they grab all the light they can, so you have a better view.
		The 130 mm (5.1") mirror on this telescope provides images that are more than 265% brighter than what you would see through a 70 mm telescope, allowing you to view fainter, more distant objects in far greater detail.
	www.vanns.com /shop/servlet/item/features/411599291 (1136 words)

	41.2" f3.9 Newtonian Telescope (Site not responding. Last check: 2007-09-17)
		A 12' ladder is required to observe with the telescope.
		The_Sky astronomy software will be able to slew the telescope from object to object, and the electronics will keep the scope tracking when not slewing.
		The rest of the telescope was built in between optical sessions.
	www.runway.net /pilots/dan/fortyone.html (661 words)

	Ed Johnson's 12 inch Spherical Catadioptric Newtonian Telescope (Site not responding. Last check: 2007-09-17)
		Ed’s telescope is a modification of the Heumann telescope and has worked well since its completion in 1968, false color never noted.
		This telescope was designed for quick and easy setup (one or two minutes), convenient eyepiece placement, precise coordinate setting (0.1min RA, 0.1degree dec), as optically perfect as possible, reduced coma.
		The Jones-Bird telescope is described in TM #3 Spring 1979 p14 - A Compact All-Spherical Catadioptric Newtonian Telescope.
	edhiker.home.comcast.net /telescope12inch.html (846 words)

	Build your own Newtonian Reflector Telescope (Site not responding. Last check: 2007-09-17)
		The Newtonian reflector telescope is practically the simplest telescope there is. It is comprised of only two mirrors and an eyepiece.
		The primary mirror (big one) is a concave mirror that takes all the light that hits its large surface and focuses it down to a small spot the size of your pupil.
		When you are looking at something far far away with a very narrow viewing angle, it is very important that your telescope is not bouncing around.
	www.angelfire.com /80s/sixmhz/telescope.html (445 words)

	18" Convertible Cassegrain/ Newtonian Telescope
		I had been using a C14 for about two years at the time, but was interested in a larger aperture telescope with a longer focal length to better image smaller sized galaxies and nebulae.
		I had seen the CN212 convertible Cass/Newt made by Takahashi, so I decided that I would build a convertible telescope that was primarily a Cassegrain and as a backup would be a Newtonian.
		The frame is the CPT18 (compact precision telescope) sold by Resource International, which was designed for a newtonian configuration.
	www.narrowbandimaging.com /cc18.htm (767 words)

	An amateur telescope maker's projects
		For most of the telescopes listed below, construction is described in detail with text, annotated photos, some CAD renderings and related Internet links.
		This weatherproof enclosure for the 22" binocular rolls clear of the telescope for horizon-to-horizon observing.
		The telescope had a metal tube, a wooden stand, and a German equatorial mount made with pipe fittings and Babbitt metal bearings.
	www.foothill.net /~sayre (253 words)

	My 8-inch Newtonian
		Additionally I went through hundreds of pages in both Sky and Telescope and Astronomy magazines at the university library to check almost every article published on telescope making (I subscribed to both in 1985, after I jumped into the ATM effort).
		Another bonus feature of Jean-Marie’s telescope was that he was repositioning the eyepiece to a convenient location by rotating the tube.
		And there it was, standing amidst other pictures, a white colored homemade newtonian (yes you guessed it right, an 8" beauty) standing on a triangular box-shaped mount, the fork arms attached to the mount with a pipe which was supporting the R.A. axis.
	members.aol.com /astroalcove/newtonian.html (3536 words)

	Anacortes Telescope & Wild Bird - Astronomy / Telescopes / Newtonian
		The beginning amateur who intends to use a manual telescope on a regular basis will find the equatorial mount to be a valuable investment.
		The Advanced Series family of non-computerized telescopes was designed to offer the novice or more advanced user a selection of models with the features and quality that serious amateurs can appreciate.
		The C10-NGT is the largest computerized Newtonian in its class with 178% more light gathering than the 6 inch model and almost twice the resolving power.
	www.buytelescopes.com /product_list.asp?t=2 (1505 words)

	31044 Celestron Firstscope 114 EQ 114mm Newtonian Reflector Telescope. (Site not responding. Last check: 2007-09-17)
		Celestron Firstscope 114 EQ 114mm Newtonian Reflector Telescope.
		The 114mm (4.5") Newtonian equatorial telescope is the most popular size telescope for the more serious beginning or intermediate level astronomy enthusiast, and for good reason.
		The large light gathering power of this 4-½" telescope makes it ideal for deep-sky observation of galaxies, star clusters and nebulae, as well as lunar and planetary observing.
	www.adorama.com /CNF114EQ.html?sid=11464718263143596 (332 words)

	Newtonian, Wholesale Telescope, Tripod Stand, SPTEL2
		A telescope is an optical system designed to magnify distant objects.
		Our wholesale telescope has an equatorial mount making it extremely versatile because it allows the scope to move in all directions.
		This wholesale telescope is a steal and is for sale at it's wholesale price.
	www.ckbproducts.com /product_info.php/products_id/1618 (115 words)

	Telescope Making
		The Amateur Telescope Making web ring comprises sites that are partly or wholly devited to the construction of astronomical telescopes by amateurs.
		Its goal is to provide a searchable index of site which are a source of ideas, inspiration and information for other telescope makers.
		Discussion and picture details of my home-built 8" Newtonian Telescope made from a 10" PVC pipe that incorporates a "DobDriver II" tracking System.
	l.webring.com /hub?ring=telescopemaking (674 words)

Try your search on: Qwika (all wikis)