All rights reserved. Here's a general purpose true field calculator: Some names, like Ultrawide, give a clue to an eyepiece's principal characteristics. Sky & Telescope maintains a strict policy of editorial independence from the AAS and its research publications in reporting developments in astronomy to readers. Return Policy. The vast majority available today have chromed barrels with a diameter of 1¼ inches (31.7 millimeters), that slide into the push-fit focusers of most telescopes. For example, your Newtonian scope is f/5: the largest-focal-length eyepiece you should use is 35 mm. Figure 3 shows the approximate true field of view of three eyepieces when used with this telescope when observing the Pleiades star cluster. Sky & Telescope is part of AAS Sky Publishing, LLC, a wholly owned subsidiary of the American Astronomical Society. They also work well for providing a darkening effect that will help you view planetary details, nebula and galaxies. The eyepiece of a telescope defines the magnification power and field of view of that … With only a rare exception, you can use any brand of eyepiece in your telescope as long as the barrel size of the eyepiece matches the barrel size of your focuser. Why? Celestron 1.25-Inch Eyepiece & Filter Accessory Kit. The letter is not the brand of the eyepiece. April 19, 2007, By: Sean Walker July 17, 2006, By: The Editors of Sky & Telescope A casual inspection of most publications advertising optical accessories will reveal a plethora of types — almost as many varieties as telescopes, it seems! This telescope eyepiece guide is meant to help guide you to finding what you most need. May 2, 2014, By: The Editors of Sky & Telescope Whether you are an amateur or an expert, we're sure you will find useful information among all of the articles that our guest authors have created. Celestron’s FREE planetarium app is an astronomy suite that redefines how you experience the night sky. The vast majority available today have chromed barrels with a diameter of 1¼ inches (31.7 millimeters), that slide into the push-fit focusers of most telescopes. It's a matter of lens size needed, not optical quality. See question six on this important topic. OpticsPlanet utilizes many guest experts to provide high quality informative content on products that we sell, how to choose the right one for your use, and provide expert advice and tips. For optically "fast" Newtonians and the like, better results will be obtained with four-element designs, such as the slightly out-of-fashion but otherwise desirable Orthoscopic, or the ubiquitous Plössl. Even if it can take 2" eyepieces, it probably has an adapter that allows you to use 1.25" eyepieces. Since an eyepiece is a lens or mirror which attached to the telescope and without this part a telescope is nothing.. Intl. Note that the same eyepiece used with a different focal length scope will give different powers. A Barlow is inserted into the telescope's focuser before the eyepiece and instantly doubles (or triples, in some instances) the magnification. Don't limit yourself to a particular brand of eyepiece. October 22, 2009, By: Sean Walker A low power eyepiece is also the eyepiece you most use for locating objects (widest field of view). Focal Length and Magnification. We want to ensure that making a return is as easy as possible! The best telescope eyepieces will be a one time investment—if you should upgrade to a better telescope you can always use your good eyepieces on the new scope. Copyright ©2020 AAS Sky Publishing LLC. The Focal Length is an important specification to consider when … ... Telescope Buying Guide: Best Telescope For Beginner; Primary Sidebar. You will also encounter designs intended to show you wide views with barrels 2 inches (50.8 mm) in diameter. The magnification will be 100x (that is, 1,000/10) and the true field will be 50°/100x, or 0.5° — so the full Moon would just nestle within the field of view. How many times have you bought an eyepiece for your telescope? If you have just purchased an astronomical telescope, odds are it uses 1.25" eyepieces. The largest-focal-length eyepiece you can use with your telescope is easy to calculate: multiply the focal ratio (the focal length of your scope divided by its aperture) by 7. Eyepieces for telescope are made in two barrel sizes, 1.25″ and 2″. This free telescope beginners guide helps people who have a manual telescope or a … Upgrading to better quality eyepieces is the easiest way to improve performance. Holding a smartphone with your hands in front of the eyepiece and trying to take a picture is almost impossible. The most common design these days is the Plossl (P). 0, Yes, I would like to receive emails from Sky & Telescope. Also, before you decide to buy that premium 2" eyepiece, be sure your telescope can accept one. Celestron Telescope Eyepiece and Filter Kit are designed to increase the versatility, functionality, universality, and efficiency of your telescope. Search this website. Please check your email for confirmation message, You said this guide was not helpful. Two inch eyepieces exist simply because you cannot squeeze a combination of long focal lengths (low magnification) and wide fields of view in a narrow 1.25" barrel. SkyPortal App. Perhaps you bought a new telescope and are wondering what to buy for it in the way of accessories, Or maybe you have an older space telescope in need of telescope eyepieces. 7mm – 9.9mm Eyepieces: These eyepieces are best for Telescopes with a Shorter Focal Length, they will help you observe good detail on planets and stars. So, the first thing you have to know is what size is your eyepiece holder on your focuser. While the Barlow is not strictly an eyepiece, our discussion would not be complete without mentioning this enormously valuable accessory. This is a figure that you'll usually see printed or engraved near the eyepiece focuser and usually lies in the range of 400- to 3000-mm, depending on the aperture and type of telescope. It is an abbreviation for the eyepiece design - the combination and type of lenses used. Together, the two focal lengths produce a magnification, calculated as the telescope’s focal length divided by the eyepiece’s focal length (for more on this, read our guide to telescope stats ). Even if you have a Meade telescope, you can use Celestron eyepieces and visa versa. For example, a 24mm eyepiece used with a telescope of 1000mm focal length yields a magnification of 42x. Eyepiece Barel Diameter. (Note: there is no harm in using a lower-power eyepiece — you will still be seeing the brightest possible view — but you will not be using all the light-collecting ability of the telescope's objective.). 10mm – 13.9mm Eyepieces: Great for use on Telescopes of all Focal Lengths. You will want a low magnification eyepiece for faint deep-sky objects or very large objects. 10 years ago, there were some smaller scopes that were made for .965” eyepieces, but I guess now they are obsolete. October 5, 2015, By: David Tytell There is one specification that is very important when you are considering an alternative eyepiece for your telescope — its physical size. One eyepiece has an AFOV of 50°, another of 68°, and another of 82°. A few older scopes use much inferior .965" (one inch) and a few scopes can use the larger format 2" eyepieces. What is sometimes more important to the user is the true field of view, which is obtained by dividing the apparent field by the magnification the eyepiece delivers. A barlow lens attaches to an eyepiece and doubles or triples the magnification of the eyepiece, depending on the magnification of the barlow. 9AM-5PM CST Sat What isn't readily appreciated by a great deal of observers is just how important good eyepieces are to scope performance. It is worth pointing out that observers who wear glasses to correct for simple long- or short-sightedness (no astigmatism) don't need to use them at the telescope; a twist of the focuser will remedy that. Another possibility is two eyepieces and a barlow lens. Fax: +1-866-534-3097 Not all telescopes take 2" eyepieces or offer a way to convert a focuser to 2" eyepieces. For example, a 24mm eyepiece used with a telescope of 1000mm focal length yields a magnification of 42x. Toll-Free: +1-800-504-5897 Telescope eyepieces that excel at both use complex lens systems of the highest quality and these do not come cheap. Premium eyepieces are typically labeled with the complete name. Figure 3 shows the approximate true field of view of three eyepieces when used with this telescope when observing the Pleiades star cluster. 2″ holders are usually on bigger and more advanced scopes. The majority of beginner level telescopes have 1.25″ eyepiece holder. At the budget end of the market, three-element (meaning they have three lenses inside) eyepieces labeled Kellner or "MA" (modified achromat) can turn in a good performance with scopes of long focal ratio, such as Schmidt-Cassegrains and traditional refractors. 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