Using this 40 mm Plossl eyepiece is an excellent way to get a wide field of view with your telescope. Most of Celestrons entry-level telescopes are sold with Kellners (and other cheap but reasonable-quality designs like RKEs or Konigs), whereas their more expensive SCTs tend to come with a single 25mm Plossl. How does that field of view impact the viewing experience? I decided to jump in with both feet and get an Orion ED80 (600mm f7.5 with a 2 focuser, So that I can move into astrophotography down the road. Some include: Parks Gold Series, Celestron Ultima's, Meade Series 4000 Super Plssls (depending on year / origin / style) and a few others that I don't remember. However, some lateral color error is apparent when looking at bright subjects, such as Jupiter or Venus, against a dark sky. I have a custom-built 32mm Plossl that has been opened up as wide as possible to 60 or 70 degrees, for use as a 2 eyepiece, although in my 10 Dobsonian at f/5 the edge distortions prevent it from seeing much use. And new proprietary designs come out from time to time. https://www.amazon.com/Orion-8829-Wide-Field-Telescope-Eyepiece/dp/B000M89H7C/ref=sr_1_2?dchild=1&keywords=Orion+Q70&qid=1606584502&sr=8-2, The Explore Scientific 68 degree series would be better but at a much higher price. This eyepiece was even better at correcting false color fringing, but because of internal reflections, the glare was even worse. Know what diameter eyepieces your scope takes. https://telescopicwatch.com/celestron-8-24mm-zoom-eyepiece-review/. What diameter eyepieces will my telescope accept? I often recommend it. Your email address will not be published. Ive read, and re-read, and re-re-read this page. The Hyperions work well in SCTs and you can't beat that large eyelens and eye relief ,JMO. For the $66/$42 of these kits, you can get one or two decent eyepieces (depending on where you buy). https://telescopicwatch.com/best-barlow-lens-and-how-to/, Celestron 8-24 Zoom Review Tele Vue has eyepieces that approach $1000. The stock 9 and 15mm Omnis were very good. Think of these as your Ford, Chevy, and Toyota of eyepieces. Good value. The Hexagon Zoom Eyepiece is made from durable plastic material that resists scratching and it has an eye relief distance of 15mm. Eyepiece Field of View Simulator astronomy.tools Field of View Simulator Change Telescope Reset Change Target Add Equipment Ever since, I have been attempting to cram in every fact about the Universe, I can find into my head. Comparing Orion Telescope & Binoculars options, it appears that a Kellner can be found for almost half the price of a Plossl of the same focal length, although there are also equally cheap Plossls available from various sellers on Amazon that are highly comparable. For that purpose it is probably easier to find one to borrow. Over time, you will likely spend more on eyepieces than on the telescope. You noted eye relief is important for those wearing glasses. If there is a local club, I would suggest you visit and consider joining. 6.5-ish mm (100x & 200x) SV207 30mm Super Plossl Eyepiece. Eye Relief: This refers to how close your eye has to be to the lens in order to see the full field of view. Lenses are fully multi-coated for excellent light transmission and reduced internal reflections. My own lineup (with a C8) is 32mm Plossl, 18.2mm DeLite, and 10.5mm Pentax (the last one not chosen to match, but rather because it belonged to a deceased friend). 5-Minute Read, How To Increase The Magnification Of A Telescope; 5-Minute Read. Orion SkyQuest XT8 Intelliscope Review document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Our team of experts has reviewed and ranked 180+ telescopes based on price and quality. Kellners can be as little as half the price of a Plossl in the same focal length, but they are generally very comparable, especially in recent years as telescope prices have fluctuated in response to changing supply chains and demand. That is up to you and your budget. Jupiter and Saturn are low in the sky now. They are usable, but your eye will be extremely close to the top lens glass. If you upgrade the telescope or add a second one, the eyepieces will work on that telescope too. A 2 barrel on the eyepiece will allow the manufacturer to create an eyepiece that provides a wider field of view. I was looking on a OPT website and they have celestron 32mm and 15mm plossl. Or, if you are buying from an online like Amazon, then look at the eyepieces I recommend and see if any suit your needs. They deliver sharp images in almost all telescopes. A 32mm plossl eyepiece and a 2x barlow lens should be enough to give you a good range of eyepieces for every use case. Etc.? Correct image diagonals are easier for beginners and they are great for using the scope during the day, but experience people dont use them for astronomy. Second? I also just bought the Celestron Starsense 102mm refractor (650mm focal length, f/6.5) as a first scope for me and my kids. Some will offer longer eye relief which can be important to eyeglass wearers. This is the link to the eyepiece I am looking at potentially buying, would you recommend this over the Orion one or vice versa do you think? When I had a 6mm Kellner, I found the eye relief annoyingly short, sure, but when compared to the 6mm Plossl that often comes with eyepiece kits, it was luxurious. You can do the calculation which will show that the 70 will have a significantly wider field of view as compared to the 52. I possess an embarrassing array of fine eyepieces with names like Ethos and Nagler and Delos. Remember that visual and AP have very different requirements, so plan on at least two different optical tubes. A Kellner eyepiece has 1 double lens and 1 single lens. Nothing will stop you from trying to go higher, but in all likelihood, the image will be poor and not worth the cost of eyepieces to achieve it. The quality of a Plossl eyepiece completely depends on the brand and model, so be very careful in our selection. Under my sky it was rare that I would be able to get over 225X and still maintain a good quality image, except on the Moon. I had a TV 20mm Plossl once. Now looking for a couple of decent eyepieces. i did buy an astro-tech 3.2 paradigm ed from a cloudynights.com forum member. So your 600 mm example (f/6) becomes, in effect, an 1800 mm focal length, f/18 but it does not change the focal length of the eyepiece. It may very well last you a lifetime and in the long term, you will definitely consider it to be a worthwhile investment. Edited April 23, 2010 by russ teh_orph Members 28 198 Author By default, expect a 40-degree field of view in a Kellner and a 50-52 degree field of view in a Plossl. The Big Bang Optics participates in the Amazon Services LLC Associates Program, which is an affiliate advertising program designed to provide a means for websites to earn advertising fees by advertising and linking to amazon.com. 20 = 90 = .8 (Svbonys Plossls, for example, are optically identical to Orions Sirius Plossls). These eyepiecesproduce a 'standard apparent feld of view' of between 50 and 56 with most set at around 52. Also, children do not often have highly developed motor skillsso I would avoid the frustration of switching out eyepieces, and consider a zoom lens. The larger barrel allows them to create an eyepiece with a higher AFOV. Brilliant article and I thank you for it, I was literally really confused prior to reading it. It had one of the best fields, edge to edge, in my SCT that I've ever seen. It uses two symmetrical pairs of glass elements (one convex and one concave) to pass the light. A 6mm Plossl has a tiny eye lens. Divide that by the magnification of that eyepiece in that scope. Plossl telescope eyepieces are the most popular type of eyepiece on the market. Plossl eyepieces have wider fields of view than Kellners. There is the 56mm Meade Plossl which magically turns my short FL refractors into their own finder scopes. It's no surprise that the eyepieces in our Sirius Plossl line are our best-selling telescope eyepieces. Super Plossls offer a smaller field of view, which makes them good for close-up views and examining small objects. EP-mm = magnification = afov Within the budget-friendly realm are the 6mm and 9mm Goldlines/Redlines (66-degree Ultra-Wide-Angle) for telescopes with a focal ratio of f/8 or longer, and the excellent 58-degree Planetary eyepieces, sold by a variety of sellers on Amazon and by Agena Astro, which come in a wide variety of focal lengths and are optically superb for their price. I beleive this is the same as they ones you asked about. But what are the other differences? Simple Plosels work well and unless you have money burning a hole in your pocket, I would start with simple affordable eyepieces. I possess an embarrassing array of fine eyepieces with names like Ethos and Nagler and Delos. If you are looking at eyepieces that are wider than 55 degrees AFOV, you will again need to consider looking at the better corrected, and typically more expensive, eyepieces. That is the critical factor. In the 1990s Meade instruments came up with a new design for the Meade 4000 line similar to Plossl that added a fifth glass element on top of the two pairs (4 total). As is outstanding in the workmanship, a Plossl type eyepiece is a moderately wide field eyepiece involving two colorless doublets in which the crown components generally face each other. It also produces an erect image, meaning you see what youre viewing rather than seeing everything upside down or sideways as some types do. Gold Line eyepieces also offer better eye relief than Plossl eyepieces, especially at the shorter focal lengths. And, the quality of the eyepiece clearly comes into play here. I often recommend a 32 mm Plossl as a good low power wide view eyepiece for scopes with a 1.25 focuser. Im fairly picky so would extend budget for better eyepieces if its worth it. Of course, the entire eyepiece must be manufactured and finished correctly to realize the design's full potential. 11 = 163 = .5 But will the Baader CO with 1.5-2-3x Barlows deliver a visibly sharper and more contrast view of the Moon and planets than the zoom lens with a 2x Barlow, to compensate for the zooms convenience that is the question! Poorly chosen eyepiece might give you poor experience and sometimes even make stargazing difficult. They have decent eye relief and little curvature of field. There is no guarantee that you will be able to get a good image of any given target at that level of magnification on any given night. By correcting for aberrations, the field of view of these eyepieces could be much larger than the soda-straw field of view in a Ramsden or Huygens, around 40 or perhaps up to 50 degrees. The original Meade 5-piece Super Plossl hasnt been in production for decades and at this point is more of a collectors item than a high-performance eyepiece. That can only be shown through actual testing. If you are just testing the waters or on a tight budget, get the Celestron, which is still pretty good. And of course, NEVER look through a telescope pointed at the sun that does not have a safe solar filter covering the front. The original design for Plossl eyepieces has existed since 1860. Orion Q70 38 mm works well. Plossls and Kellners, like other simple eyepiece designs, have moderate fields of view and tend to have short eye relief as you scale them down to shorter focal lengths. Combining a cheap eyepiece with a cheap barlow isn't a elegant solution. Lower power almost always looks better than higher power. Thanks for your comment. The Plossl was also called a Kellner Type III in some earlier references; in the 1950's, Edmund Scientific sold a "Kellner" eyepiece made from war surplus lenses, but it actually consisted of two achromats in the classic Plossl configuration. If you are on a strict budget, this is a good choice as a zoom eyepiece. By having a range of magnifications, you can optimize the image, which means you need more eyepieces. My other eyepieces, ES and Meade 82 degree, stayed in the eyepiece case most of the time. Can you give me any specific recommendations on what to buy and from where? They have a 60deg apparent field, long eye relief, adjustable eye shield and extremely well corrected. All the rest will likely be 1.25. Depending on your budget, if you only have limited funds and are just starting to fill out your eyepiece collection I would go with the zoom, then zoom with Barlow. A 15mm Plssl might be worth it, if you dont wear glasses. However, I have eyepieces that have larger exit pupils than 7 mm and they work well. These eyepieces are technically called Symmetrics, since Plossls can have different focal lengths for each doublet, but they are always marketed as Plossl. The image will be reversed left to right so you will need to get used to that. Now we can establish a target magnification range. Plssl eyepieces are affordable and they're outstanding additions to amateur telescopes. Despite this, I also have some Plossls which are indispensable. Pentax K-70 Astrophotography: The Ultimate Camera on a Budget! You have a very wide choice of brands and styles to choose from. In stargazing, eyepieces are as important as telescopes are. Even if the scope comes with the more acceptable Kelner or . Like going from a 32 TV to a 65? I recommend it often to beginners on a tight budget. Note to spectacle wearers: Plssl eyepieces with 15mm and longer focal lengths are good choices for spectacle wearers. Not really. In the case of the Celestron, you get all the focal lengths from 24 to 8mm in one eyepiece that costs $100. 4mm Eyepiece vs 20mm Eyepiece. Now we just divide it up and fill in some sample focal lengths. Then set your maximum based on your aperture and split it up. The field of view of the eyepiece has a few effects when it comes to actually using it in the telescope. Focal length telescope / focal length eyepiece = magnification or power. If you go this route, you can always add single focal length eyepieces along the way to serve specialized purposes. I expect such eyepieces are available but I have never seen or used one. Note that as we get into the higher magnifications, the millimeter jumps between eyepiece focal lengths gets smaller. Perhaps you have read about planetary eyepieces, DSO eyepieces, and other types of specific eyepieces. The Plossl has good color correction plus is free of the ghost images that plague the Kellner. My most used eyepiece is an 8-24 mm zoom. 70 mm scope will have a max of 140X for planning purposes. This may be enough for many eyeglass wearers. 32 mm = 18.75X 16 mm = 37.5X (32 mm eyepiece with a 2X barlow), 12 mm = 50X (If you have a 25 mm that came with your scope, use Barlow for 12.5 mm), 4 mm = 150X (8 mm eyepiece with a 2X Barlow), 3 mm = 200X (6 mm eyepiece with a 2X Barlow), 24 mm = 25X (the low power end of the zoom), 8 mm = 75X (24 mm zoom setting in a 3X Barlow), 2.66 mm = 225X (8 mm zoom setting in a 3X Barlow), True field of view or FOV = Apparent field of view (AFOV) eyepiece / magnification. Those that still come with Huygens and Ramsdens are generally cheap and low quality, since practically the only reason to use those designs in modern times is that they are extremely cheap to manufacture. . For modern eyepieces, the differences between Plossl and Super Plossl is going to depend on the manufacturer. We are a team of active amateur astronomers, here to help you with all your astronomy and science related needs this is anything, from reviewing the latest telescopes to be released to talking about gravity and neurons. Look at the apparent field of view specs and understand what this means for the field of view. Now here is something that some of us classic scope nuts know - there are plossls, and there are plossls. With modern multi-coated optics that thwart internal reflections, Plossls and Kellners have little difference in glare or transmission/opacity. These are effectively simple designs like Plossls, Kellners, Konigs, and RKEs, with long focal lengths, that have a lens included to increase their focal length. The Orthoscopic Plossl eyepiece is for those who are interested in performing close-up work on specimens up to three inches away from them and still get high magnification. https://www.amazon.com/Orion-8879-1-25-Inch-Enhanced-Telescope/dp/B000BMPBLK/ref=sr_1_8?crid=3KKUJRXYYN7DI&dchild=1&keywords=telescope+diagonal+1.25&qid=1610887695&sprefix=telescope+diagonal%2Caps%2C512&sr=8-8, Excellent article and very good recommendations. Plossl eyepieces are typically used for observing and viewing things at long distances, but they can also be useful when using a telescope to provide both magnifying power and erecting the images. This is important to keep in mind because it means brands have to try really hard to one-up each other because the competition in a niche hobby such as astronomy can be fierce. I just added the 4.7 mm. Im just starting out with astronomy and this really helped my understanding. Many brands of eyepieces are available, including SVBony UltraWide, Astromania UltraWide Angle, Agena Astro StarGuider Enhanced UltraWide Angle and others. I usually recommend a 32 mm Plossl type eyepiece as that provides about the widest view you can achieve with a 1.25 focuser. I also have a 25mm plossl and am happy with that. I must also warn you that some of these bad Plossls may actually turn out to be worse than any run-of-the-mill Kellner. I am not aware of any such solutions for Newtonian reflectors. This would definitely matter to observers who wear eyglasses when viewing. It sounds cool, they must be better than regular Plossls with that name, right? Higher values are slower and lower values are fasterthis is a holdover from camera lens terminology and has to do with exposure times.). If you have a longer focal length telescope, your shortest focal length eyepiece will be a higher number than what I have shown here. The one exception I would keep in mind would be when working with Newtonian reflector telescopes below F5. In addition, the eyepiece would be a Huygens or Ramsden design, where two lenses made of the same type of glass could be combined to yield minimal false color fringing, as long as the focal length of the telescope remained fairly long. For astronomical observations, such as viewing craters on the moons surface from Earth, high-magnification models are preferred because they offer more detail. However, you may see them at higher prices for the short term. I just ordered Hyperion 13mm and 21mm but I really like how sharp and crisp view is in plossl 40mm. The generic GSO Plssl from many manufacturers, including Astronomics (Astro Tech) and Agnena Astro, is as good as the Celestron and a few bucks cheaper. I cant answer that specifically as I have no experience with that eyepiece in that scope. What I can say is that, in general, eyepiece characteristics are inherent to the eyepiece. They include links to them where they can be ordered. These lenses are connected together. Omni 40mm Eyepiece - 1.25" Learn More. In retrospect, I should have included Tele Vue. Or, you can have three properly sized eyepieces and use a Barlow lens to achieve three more magnifications, which is usually a less expensive way to go. For example, if you put a 30 mm eyepiece in a 3X Barlow, it will triple the magnification you get from that eyepiece. You can email me also. This type of design provides for both total magnifications as well as an erect image with little distortion. To achieve these benefits, they may use special glass and more costly manufacturing. Just give yourself some time to learn the app and to understand the scope. Conclusion. There is no shortage of accessories for the Nexstar series. Do you have any additional comments to help me? The focal length range for 1.25 Plossls is about 6mm to 45mm. And I continue to read excellent reports on the AT Paradigm and similar under different labels. Most likely it will be used as a loaner eyepiece to go with one of my two loaner telescopes.
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