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	93506 Celestron Ultima Barlow Lens 2x 1.25".
		Barlow lenses offer an easy, economical way to increase the magnification range of your eyepieces, and Celestron carries an assortment of these highly useful lenses.
		A Barlow lens doubles the magnifying power of your eyepiece by doubling its effective focal length.
		For example, an 18mm eyepiece used with a 2x Barlow lens would have the magnifying power of a 9mm eyepiece.
	www.adorama.com /CNBLU.html (206 words)

	Encyclopedia :: encyclopedia : Gravitational lens (Site not responding. Last check: 2007-09-02)
		A gravitational lens is formed when the light from a very distant, bright source (such as a quasar) is "bent" around a massive object (such as a massive galaxy) between the source object and the observer.
		In 1937, Fritz Zwicky first considered the case where a galaxy could act as a lens, something that according to his calculations should be well within the reach of observations.
		This gravitational lens was discovered accidentally by Dennis Walsh, Bob Carswell, and Ray Weymann using the Kitt Peak National Observatory 2.1 meter telescope.
	www.hallencyclopedia.com /Gravitational_lens (1198 words)

	Eyepiece - Wikipedia, the free encyclopedia
		An eyepiece, or ocular lens, is a type of lens that is attached to a variety of optical devices such as telescopes and microscopes.
		Some coatings may also absorb light that is not being passed through the lens in a process called total internal reflection where the light incident on the film is at a shallow angle.
		They vary in their internal lens configuration and different designs are sometimes more appropriate both for different types of viewing, and for different types of telescope.
	en.wikipedia.org /wiki/Eyepiece (3327 words)

	How a Barlow Lens works
		A Barlow is a negative (diverging) lens that is placed between the objective lens (or primary mirror – from now on these words will be used interchangeably) and the eyepiece of a telescope.
		The amplification factor of a Barlow is a function of its position in relation to the eyepiece and the objective lens (or primary mirror).
		This is the approximate focal length of the Barlow.
	www.astunit.com /tutorials/barlow.htm (1081 words)

	ScopeTronix: Barlow Lenses
		This Ultima Barlow lens is, without doubt, the #1 choice among amateur astronomers who want the best performance from their optics.
		This popular, high-performance Barlow is recommended for use on telescopes with focal ratios of f/6 and longer.
		Lens diameter is 28mm; clear aperture is 26mm.
	www.scopetronix.com /barlows.htm (468 words)

	the astroscopic labs - article: barlow lens projection astro photography (Site not responding. Last check: 2007-09-02)
		The Barlow Lens Projection increases the focal length of a telescope by a factor, called amplification factor.
		When used for astrophotography the factor will slighty be bigger than noted on the Barlow lens because of the different distance of the lens to imager compared with an eyepiece.
		The Barlow Lens itself is usually a group of lenses with a negative power and build into a tube that fits the focuser.
	www.licha.de /astro_article_barlow_lens_projection.php (298 words)

	93326 Celestron Omni Barlow Lens 2x 1.25".
		This is a high quality 2x Barlow that doubles the magnification of all 1.25" eyepieces.
		This economically priced Barlow has great features like, low profile, 2-element fully-multicoated optical design and fled lens edges.
		Barlow lenses offer an easy, economical way to increase the magnification range of your eyepieces, and Celestron carries two of these highly useful lenses.
	www.adorama.com /CNBLO.html (154 words)

	Using a Barlow Lens
		The Barlow lens was invented by Peter Barlow (1776-1862) an English writer on pure and applied mathematics.
		A Barlow lens is a concave lens that when placed between a telescopes objective lens or mirror and the eyepiece, will increase the magnification of the telescope.
		If you attach a 2x Barlow lens to that eyepiece you will double the effective magnification of that eyepiece to 100x.
	telescopes.com /faq/Using-a-Barlow-Lens.html (432 words)

	barlow telescope lens
		Barlow Lens: A lens placed before the eyepiece to increase power of the eyepiece.
		He invented the Barlow lens, a telescope lens consisting of a colourless liquid between two pieces...
		The "Barlow lens", a modification of this telescope lens, is a negative achromatic...
	www.telescopes-guide.com /barlow-telescope-lens (455 words)

	OPT - 3X ED Barlow Lens - 1.25" - Model Number: OS-B3125 - $39.95
		A premium 3X barlow with ED (extra-low dispersion) glass for high quality, high contrast, high power images.
		This premium barlow is made of high quality materials, including Extra Low Dispersion (ED), fully multi-coated glass.
		A 3X barlow is great for lunar or planetary viewing and for coaxing high powers out of short focal length telescopes, like many of today's fast refractors.
	www.optcorp.com /product.aspx?pid=7749 (214 words)

	Barlow lens
		A diverging lens, placed in front of the focal point of a telescope, that increases both magnification and eye relief when used in conjunction with an eyepiece.
		The magnification is typically doubled, though at the cost of a fainter image.
		Invented in 1834 by the English engineer and mathematician Peter Barlow (1776-1862), the lens is used commonly by amateur astronomers.
	www.daviddarling.info /encyclopedia/B/Barlow_lens.html (132 words)

	Find Telescopes and Telescope Accessories in One Place
		A Barlow lens makes the magnification of your telescopes even greater than it was made to
		Be sure that the Barlow lens you choose will fit your current eyepeices.
		Buying a Barlow lens for your telescopes is a great idea since they cost less than eyepieces and increase the magnification.
	www.telescopes.name (749 words)

	Televue Tele-vue New 5x Powermate Barlow lens 1.25 - T Ring (pmt5126) - Find, Compare, and Buy at DealTime
		The 2.5X Powermate Barlow is a 4-element parfocal, compact amplifying lens system.
		While it looks and functions like a Barlow, your eyepiece will operate with pupil locations where the designer intended, avoiding mismatch problems.
		No additional "interface lens" is needed, since POWERMATES have it built-in.
	www.dealtime.com /xPC-Televue_Tele_vue_New_5x_Powermate_Barlow_lens_1_25_T_Ring (332 words)

	Meade ETX #128 3X Barlow Lens 1.25'' - 07278 - WolfCamera.com
		Inserted into the telescope's eyepiece holder, these Barlow lenses respectively double or triple the power obtained when an eyepiece is used alone.
		Both Barlow lenses include two optical elements for high-resolution, color-corrected imaging.
		Your payment information and privacy is guaranteed to be 100% safe & secure.
	www.wolfcamera.com /product/513951293.htm (66 words)

	Celestron Telescopes Barlow Lenses w/FREE UPS
		If you’re looking for an affordable way to achieve high-power viewing of the moon and planets, double stars and even close-up views of terrestrial subjects, Celestron 2x-1-1/4" Barlow lens is the answer.
		This Ultima Barlow lens 2x 1 - 1/4 " is, without doubt, the #1 choice among amateur astronomers who want the best performance from their optics.
		Ultima Barlow Lens features a very high quality, fully multicoated design.
	www.opticsplanet.net /celestron-telescopes-barlow-lenses.html (648 words)

	LOMO 2x Barlow Lens
		This model of LOMO Spotting Scope Accessories are discontinued and no longer available.
		A 2x Barlow lens doubles the magnifying power of your eyepiece by doubling its effective focal length.
		For example, an 20mm eyepiece used with a 2x Barlow lens would have the magnifying power of a 10mm eyepiece.
	www.opticsplanet.net /2xbarlowlens.html (347 words)

	Meade 70mm Refractor Telescope 50% OFF w/ FREE Binocular, FREE S&H w/ Tripod Eyepieces Discount Telescope for Beginners
		Somewhat larger than the 60mm type scopes, the increased objective diameter of the Meade 70mm Refracting Telescope produces an image over 30 percent brighter at the same magnification, with increased sharpness and clarity.
		Meade Telescope 70AZ ADR features a multi-coated, achromatic objective lens of 70 mm diameter (700mm focal length, f10); rack and pinion 1.25" focuser with diagonal, metal altazimuth telescope mount with fl "hammered" paint finish, steel cable controls for both vertical and horizontal motion of the mount.
		Meade 2X Barlow lens is also included which doubles the effective magnification of the above telescope eyepieces.
	www.opticsplanet.net /as70zmzoomsp.html (1303 words)

	Sun Viewers
		Attaches to front of PST increasing the surface detail on the sun.
		A fully complimentary and similarly optimised, X2 Barlow lens is also available for increasing the magnification options.
		Has anti-static lens brush, cleaning solution, anti-static cloth, spec grabber.
	www.kansaswindpower.net /sun_views.htm (931 words)

	Celestron C130mm Mak Spotting Scope 52275 (C130 mm Maksutov scope) FREE Luxury Case, Lowest Price Online! w / FREE UPS
		Whether you need a high end zoom spotting scope, or a small portable model, we have a Celestron scope for you - always onsale with Free UPS Ground shipping and low competitive price!
		Want to use your spotting scope as a long telephoto lens?
		Photoapaters and mounts are available for our Celestron spotting scopes making them perfect for wide field astrophotography as well as nature photography.
	www.opticsplanet.net /celestron-c130mm-mak-spotting-scope.html (963 words)

	Bushnell 3" Reflector Telescope 65% OFF FREE UPS w/ Land Eyepiece, Red Dot Finderscope, Tripod
		Bushnell 3" Reflector Telescope 65%OFF w/ Land EP, Barlow, Software CD, Tripod 789669 w/ FREE UPS
		Bushnell 420x3" ALT-AZ Reflector Telescope 789669 - this Bushnell telescope is the perfect beginner telescope for those
		Telescopes FAQ - How To Setup and Use A Telescope
	www.opticsplanet.net /bush-ts-785003.html (1300 words)

	Bushnell Sentry Spotting Scope Free UPS 50%OFF Tripod Window Mount Hard Case Life Warranty
		50mm objective lens for a clear, bright image
		Specifications for Bushnell 16-32x50mm Sentry FLP Spotting Scopes:
		Bushnell Optics Accessories Kit 109999C Premium Upgrade neck strap, Lens cleaning tool, leaning cloth, cleaning solution
	www.opticsplanet.net /787332.html (793 words)

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		Meade Series 4000 Eyepiece & Filter Set - 6 Meade Telescope Eyepieces, #126 Barlow Lens, 4 Color Filters, ND96 Moon Filter & Aluminum Case - 07169 w/ FREE UPS
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	www.opticsplanet.net /meade-brand.html (1182 words)

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