
	Where results make sense

Topic: Eyepiece

In the News (Mon 6 Oct 08)

Eli Manning

Josh Beckett

Sage Rosenfels

South Ossetia

Super League

Angelina Jolie

West Bengal

Wayne Rooney

Howard Stern

Beth Ostrosky

	Facts about topic: (Eyepiece) (Site not responding. Last check: 2007-10-13)
		An eyepiece is a type of lens that is attached to a variety of optical devices such as telescope (A magnifier of images of distant objects) s and microscope (Magnifier of the image of small objects) s.
		The eyepiece is placed at the focal point (A central point or locus of an infection in an organism) of the objective to magnify this image.
		Eyepieces have a focal length (The distance from a lens to its focus), which is usually expressed either in millimetre (A metric unit of length equal to one thousandth of a meter) s, or by indirectly stating the magnification that the eyepiece produces when combined with a particular telescope or microscope.
	www.absoluteastronomy.com /encyclopedia/e/ey/eyepiece.htm (1422 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.
		The focal length of an eyepiece is the distance from the principal plane of the eyepiece where parallel rays of light converges to a single point.
		Eyepieces are differentiated by their field stop, which is the narrowest aperture that light entering the eyepiece must pass through to reach the field lens of the eyepiece.
	en.wikipedia.org /wiki/Eyepiece (3242 words)

	eyepiece
		In practice, eyepieces contain at least two lenses: the field lens, which faces the objective and collects the light from it, and the eyelens, which faces the observer and magnifies the image.
		There are various types of eyepiece design, from very simple achromatic lenses to complex eyepieces with many optical elements.
		A four-element eyepiece (typically with a simple lens nearest the eye and a cemented triplet further away), more expensive than a Kellner, considered among the best eyepieces for lunar, planetary, and double-star work, and a good choice for eyeglass wearers because of their long eye relief.
	www.daviddarling.info /encyclopedia/E/eyepiece.html (800 words)

	Eyepieces Telescope Eyepiece Types Design Variations oculars
		The main function of an eyepiece is to magnify the image that is formed by the telescope optical system, it gathers all the light rays and forms a sharp image at the focus.
		These eyepieces are usually designed with a red LED as the light source powered by a small watch battery and the intensity of the red LED can be changed by a small potentiometer (control).
		The distance between the lens of an eyepiece and the point behind the eyepiece where all the light rays of the exit pupil come to a focus and the image is formed.
	www.aoe.com.au /eyepiece_types.html (1751 words)

	Eyepieces
		The magnification of a telescope is determined by dividing the focal length of the telescope by the focal length of the eyepiece.
		Since, like most eyepieces, the field lens is actually located somewhat past (to the left of, in this diagram) the image plane, it is still possible for corrections made in the field lens to have an effect on the image of the eyepiece.
		The eyepiece is designed so that the image formed by the telescope should be formed on the flat surface of the field lens, which does have the problem that any dust on that lens will be clearly visible rather than out of focus when using the telescope.
	members.shaw.ca /quadibloc/science/opt04.htm (2870 words)

	THE EYEPIECE OR - Encyclopedia Britannica - THE EYEPIECE OR - JCSM's Study Center (Site not responding. Last check: 2007-10-13)
		The two most customary eyepieces consist in two simp:e piano-convex lenses, whose distance one from the other is equal to half the sum of the two focal lengths.
		The Ramsden eyepiece is the most convenient for this because this plane lies in front of the collective lens, and the objective image has not yet been influenced by the eyepiece.
		By the magnification of the objective is meant the ratio of the distance of distinct vision to the focal length of the objective.
	jcsm.org /StudyCenter/Encyclopedia_Britannica/TAV_THE/THE_EYEPIECE_OR.html (831 words)

	Shallow-Sky list Planetary Eyepiece FAQ
		Eyepiece choice for planetary observing may be different than eyepiece choice for deep-sky observing.
		For this reason it is generally good to compare the scattering characteristics of a new eyepiece with that of an eyepiece that is already known.
		Some people like the Vixen/TeleVue 8-24mm zoom eyepiece for planetary observing; although it's not considered as sharp as fixed focal length eyepieces, it's still fairly sharp, and sometimes it's helpful to be able to choose an in-between focal length based on sky conditions, and adjust it as necessary.
	www.shallowsky.com /eyepiece-faq.html (1717 words)

	PAS Advanced
		Huygens eyepieces are generally the least costly eyepieces on the market.
		The 0.96 inch eyepieces are generally found on cheap department store telescopes, I would not recommend buying a telescope only capable of using them, as they can be very difficult to find.
		The market is literally flooded with eyepieces, all of which are geared to achieving the best field of view, magnification without sacrificing image quality.
	www.astronomical.org /astbook/eyepiece.htm (1219 words)

	Astronomical Telescope Eyepieces: A Discussion for the Beginner
		Eyepiece design and performance is fascinating, and many technical sources explain what's what, but I would like to give some simple, practical comments that might otherwise get lost in minutia.
		The magnification of a telescope is the ratio of its focal length to the focal length of the eyepiece in use.
		For eyepieces of a given design (Kellner, Orthoscopic, Plossl...) the width of the field of view is generally inversely proportional to the magnification -- doubling the magnification cuts the field width in half.
	www.observers.org /beginner/eyepieces.freeman.html (6346 words)

	Nikon MicroscopyU: Interactive Java Tutorials - Eyepiece Reticle Calibration
		In this case, loosen the thumbscrew (usually located at the front of the stage, beneath the specimen platform) and rotate the stage until the micrometer and the eyepiece reticle are parallel.
		Position the eyepiece reticle directly over the micrometer (with the stage controls) and align the left-hand rule in the reticle with one of the longer, numbered (100 micrometer) division lines on the stage micrometer (Figure 1(b)).
		Depending upon the objective magnification factor and eyepiece field diameter, a distance ranging between 150 micrometers and 4 millimeters (twice the length of the stage micrometer scale) will be visible in the eyepieces.
	www.microscopyu.com /tutorials/java/reticlecalibration/index.html (2017 words)

	Starizona CCD Guide - Eyepiece Projection Calculator (Site not responding. Last check: 2007-10-13)
		Changing the eyepiece changes the magnification, as does increasing or decreasing the distance from the eyepiece to CCD (some adapters are adjustable in this manner).
		The distance from eyepiece to CCD is typically in the range of 90-120mm.
		Then enter the focal length of the eyepiece you will use for eyepiece projection imaging and the distance from the eyepiece to the CCD chip.
	www.starizona.com /ccd/calc_eyepiece.htm (106 words)

	Tutorial: Digital Camera Imaging with a Telescope
		Since an eyepiece has to fit within a standard projection adapter there are limits to the size of eyepiece which are suitable.
		An adapter similar to the eyepiece projection adapter is used but the eyepiece image is optically coupled through the camera lens rather than being projected directly onto the film plane.
		The MaxView 40™ is a 1.25" eyepieces and the MaxView II is a 2" eyepiece.
	www.scopetronix.com /digicam.htm (6024 words)

	The ATM's Workshop - An Eyepiece Storage Case
		While this technique works well for large eyepieces accessories with a rectangular form factor, it doesn't work as well when applied to smaller 1.25" eyepieces which would fit more compactly in a vertical position.
		I wanted to allow room for each of these in the eyepiece case even though some are seldom used anymore.
		I decided to allow 0.5" space between each of the eyepieces and also allow 0.5" space around the edges of the foam holder.
	www.atm-workshop.com /eyepiece-case.html (1205 words)

	Eyepiece Adapters - Olympus OM Photomicro Group
		The eyepiece adapters are designed to clamp on to the eyepiece tube of a microscope, and provide a dovetail fitting to which the Photomicro Adapter L can be clamped.
		For the G 10× eyepiece, the middle section of the adapter is not used; the eyepiece is inserted in the bottom section, and the top section is screwed on top of it.
		Pressing down the eyepiece against the photo tube slightly, raise the Eyepiece Adapter until it contacts with the eyepiece flange (be sure the eyepiece flange is in contact with both the photo tube and Eyepiece Adapter) and lock the adapter firmly with clamping screw.
	www.alanwood.net /photography/olympus/eyepiece-adapters.html (1121 words)

	Nagler Eyepiece Overview
		As a result, the eyepiece maintains a much larger "eye lens" (the one you look through) and a much longer eye relief than you would expect from the given focal lengths.
		As with the 4.8 mm Nagler, this eyepiece is under significant fire from the new 6 mm and 8 mm Radians, which are much more comfortable and per- haps even a little sharper.
		Still, the 16 mm is a whale of an eyepiece - comparing one to a conventional 15 mm Kellner or Plossl is a humbling experience (for the Kellner or Plossl, that is...) Strangely, the 16 mm is slightly smaller and lighter than the 12 mm.
	www.scopereviews.com /page2.html (3721 words)

	Celestron -- Telescope Basics
		A star diagonal (a prism or mirror set at a 90 degree angle to the telescope tube) is designed to make viewing of the sky more convenient and comfortable and swivels right and left as required.
		The eyepiece used with a telescope magnifies the image that is formed by the main optical system.
		Barlow Lenses, Eyepiece Filters, Motor Drives, T-Adapters, Dec. Motors, Guiders, LPR Filters, Tele-Extenders, Solar Filters are the names of a few accessories in an enormous offering of accessories for telescopes.
	www.celestron.com /tb-mtrms.htm (854 words)

	ScopeTronix Eyepiece Accessories
		To use a parfocalizing ring with a flip mirror you would first use the telescope focus knob to put your attached camera in perfect focus, now slide a ring over the eyepiece of choice and raise and lower the eyepiece in the holder until it is perfectly in focus.
		Sometimes when using parfocalizing rings or certain photographic equipment, or when eliminating a diagonal your eyepiece may be barely hanging on or simply too short to reach focus.
		The eyepiece is held in place by a compression ring and then the extension slides into the eyepiece port.
	www.scopetronix.com /epacc.htm (989 words)

	Meade #902 Electronic Eyepiece 07166 for Telescope, Spotting scope Video out to TV / VCR w/ FREE UPS
		Meade Electronic Eyepiece 07166 transmits live video images of the Moon, Sun, planets and terrestrial subjects via a single cable to a TV, VCR or camcorder, images can be recorded for later playback or frame-grabbing.
		Meade #902 Electronic Eyepiece 07166 uses a CMOS detector of 320 x 240 pixels to form fl and white images at the telescope focus; barrels are included to allow for insertion of the eyepiece into either 0.965” or 1.25” focuser sleeves.
		The fact that it looks, weighs, and costs about the same as a conventional eyepiece only sweetens the deal...The Meade #902 Electronic Eyepiece is a smartly designed unit with an RCA video output jack on the side and a thumbwheel control that turns the unit on and adjusts image contrast.
	www.opticsplanet.net /me-electronic-eyepiece.html (744 words)

	Stargazer Steve Telescopes - Eyepieces and Magnification
		The magnification obtained with a specific eyepiece is simply the focal length of the eyepiece divided into the focal length of the telescope.
		Forinstance, if the optional 7.5 mm eyepiece is used with the 765 mm focal length Sgr-3 reflector, the magnification would be 765 / 7.5 or 102 times (102 X).
		If an eyepiece of too short a focal length is used, the resulting magnification can easily exceed the ability of the atmosphere to transmit clear detailed images.
	stargazer.isys.ca /eyemag.html (416 words)

	Kellner eyepiece (Site not responding. Last check: 2007-10-13)
		Kellner eyepiece - The simplest and least costly of all the color corrected eyepieces.
		It typically has slightly more false color than other more expensive eyepieces and a fair amount of astigmatism.
		This tilt causes the light to enter the eyepiece at the side of the telescope’s tube.
	www.singularsci.com /Glossary4.htm (245 words)

	Meade Wide-angle 4 Element 18mm Eyepiece 1.25"
		This Meade 4 Element Plossl (PL) Eyepiece 07139 is specifically designed for use with ETX 60mm and 70 mm models and yields a power of 19x.
		The 4 element wide angle WA18mm eyepiece #07139 yields extremely wide fields of view with either telescope, ideal for scanning star fields or for terrestrial applications.
		Note that magnifying powers are doubled or tripled, respectively, when an eyepiece is used in conjunction with the #124 2x or #128 3x Barlow lenses.
	www.opticsplanet.net /meade-wa18.html (349 words)

	TeleVue Panoptic Eyepiece Overview!
		There seems to be some reluctance amongst astronomers to shell out $200+ for such a small eyepiece, but once you pick it up, feel the weight, and look through it, it becomes quickly obvious that something special is going on.
		It can also double as a planetary eyepiece (until you can pick up a 7 mm Nagler!) There is one drawback, that of the really short eye relief.
		This is a big, heavy eyepiece (right up there with the 13 mm and 20 mm Naglers), that looks somewhat like one of those giant vitamin bottles at your local health food store.
	www.scopereviews.com /page4.html (1380 words)

	CosmicOne - Ultra Cheap Collimation Eyepiece
		A very professional looking sight tube can be made for both 1.25" focusers and.965" focusers by removing the lenses from the shortest focal length eyepiece you got with your telescope.
		No - don't destroy a good eyepiece - but most department store scopes come with a useless 4mm eyepiece made with very tiny lenses.
		These eyepieces are usually of poor manufacture and design - and they give way too much magnification to be useful.
	www.lymax.com /cosmicone/collimator (962 words)

	Weasner's Meade Electronic Eyepiece Page
		Subject: Moon Meade Electronic eyepiece Sent: Sunday, March 10, 2002 11:22:52 From: drygulch_99@yahoo.com (Thomas Dorman) This was a image I took of the Moon during the Feb.20 2002 occultation of Saturn and the Moon.
		Subject: Meade electronic Eyepiece Sent: Friday, January 17, 2003 12:31:01 From: RRoday@wpcarey.com I have shot the moon (can't miss) Jupiter and Saturn through my Meade Electronic Eyepiece (MEE) and ETX 125 but each time, I have trouble finding and centering on the planet.
		There was much turbulence in the sky when I took the movie of the moon with the electronic eyepiece, but it worked fine after all.
	www.weasner.com /etx/astrophotography/electronic-ep.html (1373 words)

	Telescope Calculator - www.scopesim.com
		Telescope Calculator enables the following settings to be adjusted: telescope focal length, telescope aperture, eyepiece focal length, eyepiece apparent field of view, barlow settings, and celestial object to be viewed (Moon, Mars, Jupiter, Saturn, Pleiades).
		The following telescope calculations are updated in realtime: telescope magnification, effective focal length, telescope focal ratio, eyepiece exit pupil size, true field of view, and eyepiece field stop.
		In addition, there is a calculation to approximate the gradual degradation of image quality as magnification is increased.
	www.scopesim.com (260 words)

Try your search on: Qwika (all wikis)