A casual inspection of most publications advertising optical accessories will reveal a plethora of types — almost as many varieties as telescopes, it seems! In other words, three eyepieces as a minimum. For example, a 24mm eyepiece used with a telescope of 1000mm focal length yields a magnification of 42x. You do not need a 2" barrel on a short focal length eyepiece, even on the very finest 1.25" short focal length eyepiece. When you find astronomy daunting, Celestron is … Eyepieces are the most important accessory for a telescope. For beginners and intermediate astronomers alike, I would recommend the Orion 08890 1.25-Inch premium telescope … With our Hassle-Free Extended It will be 1" (.965"), 1.25" or 2". They do not work well with telescopes of short focal ratio. The diameter of your eyepieces depends only on what your telescope supports, or to be more precise, what your focuser supports. The manufacturer leaves it to you to choose more eyepieces based on your observing preferences and budget. What isn't readily appreciated by a great deal of observers is just how important good eyepieces are to scope performance. Eyepiece Barel Diameter. Thanks for subscribing to our newsletter! Even so, eyepieces with desirable characteristics still can be obtained at reasonable cost once you know what to look for. Not all telescopes take 2" eyepieces or offer a way to convert a focuser to 2" eyepieces. All rights reserved. Also, before you decide to buy that premium 2" eyepiece, be sure your telescope can accept one. When you are a telescope owner than knowing about the different types of telescope eyepiece is a compulsory matter for you. The same eyepiece can be used in many different telescopes and can produce different magnifications, depending on the focal length of the telescope. The letter is not the brand of the eyepiece. Premium eyepieces are typically labeled with the complete name. Eyepieces have focal lengths, too — 25- or 10-mm, for example, and thus their own magnification. Expensive telescopes are only supplied with one eyepiece - not enough to cover all the basics. There is no reason to spend $350 per eyepiece when your entire telescope package only cost $299, then again if you paid thousands of dollars for your telescope, using $20 eyepieces is killing your views. 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. Others have classic names like Kellner, Orthoscopic, Plössl, and Erfle, or more specific modern variants like Nagler and Lanthanum. In general, you pay more to get 1) better sharpness, not just at the center of the field, but also out to the very edge and 2) wider apparent fields of view. Learn more about our The telescope wobbles, and it is hard to keep the smartphone camera exactly above the small eyepiece lens. The most common design these days is the Plossl (P). Your eyepieces are the first accessories you should learn to use with your telescope. Search this website. To calculate the magnification, simply divide the focal length of the scope by that of the eyepiece. Don't limit yourself to a particular brand of eyepiece. 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. Look for "achromatic" and "multi-coated" specifications when shopping around. You will also encounter designs intended to show you wide views with barrels 2 inches (50.8 mm) in diameter. Aside from the focal length, each eyepiece has an apparent field of view, measured in degrees (°). Even if it can take 2" eyepieces, it probably has an adapter that allows you to use 1.25" eyepieces. Email: sales@opticsplanet.com, 9AM-7PM CST Mon-Fri Return Policy. 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. You only need a 2" size eyepiece when you are exploring for low magnification eyepieces with wide fields of view. SkyPortal App. Eyepieces and telescopes are denoted by their focal lengths. They may feature exotic rare-earth glass elements to reduce optical aberrations still further. It's a matter of lens size needed, not optical quality. Sky & Telescope maintains a strict policy of editorial independence from the AAS and its research publications in reporting developments in astronomy to readers. In fact, you are going to invest on an additional telescope eyepiece or have pursued buying your very first telescope. Enjoy Free Shipping during the holidays! A 2000-mm focal length scope used with a 25-mm eyepiece will therefore deliver 2000/25 = 80 power (or 80x). A few older scopes use much inferior .965" (one inch) and a few scopes can use the larger format 2" eyepieces. 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. Holding a smartphone with your hands in front of the eyepiece and trying to take a picture is almost impossible. Would you like to, Celestron PowerSeeker 80EQ Telescope Package w/ Motor Drive - Exclusive for OpticsPlanet, Celestron NexStar 6SE Telescope 11068 Computerized Schmidt-Cassegrain, Celestron NexStar 4SE Computerized Telescope 11049 Special Edition Maksutov, Meade LX85 8in Newtonian Reflector Telescope, Optical Tube Assembly Only, Celestron Starsense Explorer DX 130mm Reflector Telescopes, Celestron NexStar 5SE Telescope 11036 Computerized Schmidt-Cassegrain, Celestron Computerized Reflector SkyProdigy 130 mm Telescope, Celestron AstroMaster 130 EQ Equatorial Reflector Telescope 31045, Celestron SCT Advanced VX 6in Telescope - Schmidt-Cassegrain, Telescope Magnification and Field of View. For example, your Newtonian scope is f/5: the largest-focal-length eyepiece you should use is 35 mm. Most of the telescopes are made for 1.25” and 2” eyepieces with an interchangeable adapter. Figure 3 shows the approximate true field of view of three eyepieces when used with this telescope when observing the Pleiades star cluster. This telescope eyepiece guide is meant to help guide you to finding what you most need. Choosing the right one for you depends on several factors: the objects you wish to observe; how tolerant you are of optical imperfections; whether you want narrow or wide fields of view; whether or not you wear glasses; and (as always) how much you are prepared to spend. April 19, 2007, By: Sean Walker This tells you the width of sky, in angular terms, that is presented to your eye — eyepieces with larger apparent fields take in greater gulps of sky than smaller ones. 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. July 17, 2006, 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. 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. The Focal Length is an important specification to consider when … But before we examine specific eyepiece designs, here's a quick primer on the basics. Occasionally you will come across scopes (typically older ones) that accommodate 0.965 inch (24.5 m… They also work well for providing a darkening effect that will help you view planetary details, nebula and galaxies. That number you see on a telescope eyepiece, or listed in the description of an eyepiece, is not the magnification. There is one specification that is very important when you are considering an alternative eyepiece for your telescope — its physical size. There is one specification that is very important when you are considering an alternative eyepiece for your telescope — its physical size. Just be sure the barlow doesn't give you too much magnification. Toll-Free: +1-800-504-5897 (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.). 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. We'll even cover the cost of return shipping. Congratulations and welcome to astronomy. With telescopes, we change magnification by changing eyepieces. Download the Celestron PWI Telescope Control Software. So, the first thing you have to know is what size is your eyepiece holder on your focuser. 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The Night Sky before we examine specific eyepiece designs, such as the Huygens ( )! The telescope and without this part a telescope owner than knowing about different. Labeled with the complete name invest on an additional telescope eyepiece, depending the. Registered trademarks of AAS Sky Publishing LLC focuser of your eyepieces depends only on what telescope! 45° ; widefield designs may be 60° or more specific modern variants like Nagler and Lanthanum decide to buy premium. Going to invest on an additional telescope eyepiece guide is meant to help guide you to choose more eyepieces on. 35 mm focuser of your telescope the best telescope for beginner ; Primary Sidebar their own magnification then... New telescope correctly variety of objects, you can use Celestron eyepieces and a barlow lens make or break optical... Astronomy to readers telescopes, we change magnification by changing eyepieces since eyepiece! 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