Kellner eyepieces have 3 lenses cemented together and have a 35-50 degree field of view. Have Any Astronauts Been Lost in Space Forever. Second? The difference in TFOV will be significant at this focal length. Then there is a pair of 32mm and 20mm TV Plossls which make my binoviewers work well with a Daystar Quark H-alpha solar filter. Plossls provide very good eye relief for eyeglass wearers in focal lengths of about 25mm and longer. Learn more about our story and the team behind the scene. I saw Jupiter today and its 4 moons but when I looked at saturn I struggled to get a really clear image and it was very small. Best suited for telescopes with f-ratios f6 or slower. They are 82-degree AFOV eyepieces. In my scopes a simple zoom eyepiece like the Celestron 24-8mm or the Baader has replaced the higher powered plossls. If money is not a concern, you cant go wrong with Tele Vue eyepieces, any Tele Vue eyepieces. Below 20 however, the eye relief makes it difficult for me and my glasses so Ive been replacing my 5-15 EPs with 82 degree EPs with more relief. If you just want eyepiece recommendations and dont care about the details, Im adding that section right below before we go into the specifications that answer the above questions and make use of the formulas. They are not that expensive I would pay about $100 for both eye pieces. You have selected a very good starting telescope that will serve you for many years to come. As a result, this can cause aberrations in the image as you move from the center of the view toward the edges. See if you will observe with or without your glasses. It costs three to four times as much as the Celestron Zoom, but if you have the budget, this is the one to get. i dont have 1 of everything, and i bought the best i could afford on a low budget; meade and orion. Sirius Plossls offer a 52-deg apparent field of view for clear, sharp images. Can you help me. These come in focal lengths from 2.3 mm to 25 mm. As I discussed earlier, the zoom lets you explore your target over a wide range of magnifications without having to change eyepieces. For your application and the eyepieces you have or are going to get, you really dont need anything else. But you need to know, first, if you will be wearing glasses when you observe. Now we can establish a target magnification range. https://telescopicwatch.com/orion-skyquest-xt8-intelliscope-review/. If that is the case, it will give me another reasonably good, inexpensive zoom to recommend to beginners. FOR SALE! Although Kellner eyepieces will help you learn a lot in the beginning but soon will realize that youre missing out on something, and eventually you will be tempted to spend money on another good quality eyepiece. Offering a wide 52 apparent field of view, these 10mm, 17mm, and 25mm Orion Sirius Plossl Telescope Eyepieces provide extremely sharp images of impressively high contrast. Now you can get good eyepieces for under or around $50. The Expanse is a lens that provides an extra sharp image, and it also has a wider field of view compared to the Plossl eyepiece. The Big Bang Optics was started because of our love for astronomy and to help others like us find the best telescope and accessories. It is pretty much worth it for everyone that has a telescope with a 1.25 inch focuser to have a 32mm Plssl. This is my all-time favorite eyepiece and the one I use more than all the others put together. Comparing to Plossl, the Expanse eyepiece is a lot more expensive. There is no problem using a Celestron eyepiece in a Meade telescope, for example. Imagine you are looking at the moon with each of these eyepieces and consider what you would see. You will see these under many brands, including Orion, Celestron, GSO, and others. They deliver sharp images in almost all telescopes. Brilliant article and I thank you for it, I was literally really confused prior to reading it. I agree. They provide a range of magnifications with one eyepiece. It was named after Peter Barlow who invented it in the 1800s, so it is usually capitalized. Not really. Most people will be fairly comfortable with eye relief of 12 mm or higher. A large field lens makes the ocular easy to look into. 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? Thanks so much. This also makes them more resistant to any form of dust getting inside the eyepiece. Even though the design has existed for more than a century, it has stood the test of and is still today the standard against which other eyepiece designs are measured. This is perfect for a 25mm Plossl (an extremely common standard) and downright luxurious with a 32mm Plossl, but when you get below about 12.5mm or 10mm, it can begin to get difficult to use. Those are significantly more expensive than the 1.25 focal lengths. While many people will stay with and add Plossls to their eyepiece set, I would recommend not going below 10 mm focal length as the eye relief gets quite short. Also worth mentioning i wear glasses which I will wear while observing. Get to know more about us here. Thanks in advance I really appreciate it! Question: would it perform well with 1.5/2x and 3x Barlows? . I am considering buying another eyepiece, maybe 6mm, and a Barlow, maybe 2x, to give me a wider and higher range of magnification. Hayppy that now I have more facts to put in my decision. For super Plossl eyepiece, the field of view is typically 40 to 60 degrees. (often referred to as Pseudo Masuyama). document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Since 2011, we've published astronomy related content and reviews to help guide the community better. Thus the 30 mm eyepiece in a 600 mm telescope produces 600/30 = 20X magnification while with the Barlow, we have 1800/30 = 60X. There is always more to learn but it helps if you go in with a good base understanding, and that was my goal. I beleive this is the same as they ones you asked about. What Is A Barlow Lens For A Telescope? A decent barlow might cost as much or even more. However, if you want to optimize your viewing experience, youll need to invest in a better-quality eyepiece. Differences and Similarities. Goldline series of eyepieces provides the best value in this price range, better than Plossls. Look at the apparent field of view specs and understand what this means for the field of view. To say it a different way, in general, an F5 scope will place more demands on the eyepiece around the edge of the field of view than an F10 scope. Non-eyeglass wearers can usually tolerate Plossls as short as about 10-12mm before their eyelashes start brushing the ocular lens. Fortunately, the investment can be leveraged with future scopes since eyepieces are standard sizes so they work in almost any telescope. Is it just about finding and framing, or do wide fov EPs create a more immersive experience? These sizes have become the industrys standard sizes. If your scope uses eyepieces that are closer to 1, then you have an old style .965 that is now obsolete. Between Kellners and Plossls, this means a 32mm Plossl, which maximizes the field of view in the 1.25 barrel diameter format, will show more stars than either a 32mm Kellner with the same magnification but a smaller true field of view, or a 40mm Kellner (or 40mm 1.25 Plossl, which has a 40 degree apparent field of view) with a lower magnification and the same true field of view. Are plossl eyepieces still worth it? This will give you a lower power and a medium to high power eyepiece, depending on the focal length of your scope. I am a BIG fan of zoom eyepieces, especially if you dont have many. I've got a one-off plossl like that in my kit that I'll probably never sell, (aside from my 5 element ones) and it's one that is rarely seen. That's how cost-efficient the entire package is! There are many more designs that are associated with specific brands, but the ones above are designs that are produced by many companies in one form or another. The biggest advantage is much better ER in a large ocular. Interesting points Philip. Is there anyway you could include links to the eyepieces you mentioned in the last paragraph of your reply as Im totally new so worried about buying the wrong thing! Find many great new & used options and get the best deals for Meade 32mm 2" 5-element Super Plossl Wide Field Eyepiece at the best online prices at eBay! Glad you found it helpful. Think of these as your Ford, Chevy, and Toyota of eyepieces. https://telescopicwatch.com/best-telescope-eyepieces/. Now, for my one or two low power eyepieces, I also like to know the field of view provided by that eyepiece. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); Stargazing Help came into existence when some young minds got mesmerized by outer space while camping. This design features 4 lenses that are paired in two close-set doublets for the eye lens and the field lens. The magnification range that is appropriate to your scope. Even though both eyepieces are very common in beginner telescopes, it has become harder to find Kellner eyepieces on their own in the last two years, whether they come from a brand name or the original equipment manufacturer or a reseller. I havent been into the hobby for long but my experience is in line with whats been said. philhas Members 61 459 Location: North East England Some people have more than 6 and some have as few as 3. They also have good eye relief, making them comfortable to use for extended periods. Compared with a zoomable telescope eyepiece, they are pretty much the same in terms of the quality of the image. Do you think the Baader Hyperion Zoom would work OK with the Skywatcher 150p? This may be enough for many eyeglass wearers. They also offer more eye relief than Plossls at the shorter focal lengths. Again, this is more noticeable in lower focal ratio scopes. Now we just divide it up and fill in some sample focal lengths. Am I correct? A long eye relief is also important for those who wear eyeglasses at the eyepiece, whether thats a member of the general public at a star party or an astronomer with astigmatism, which, unlike near- or far-sightedness, cannot be corrected with the telescopes own focuser. This type of design also helps provide for eye relief; its a better experience if your eyes. These low-quality Plossls lack an internally blackened lens barrel with thread baffles and blackened lens edges and sophisticated anti-reflection multi-coatings, all of which are a necessity to produce an excellent image. Kellners are the other popular design for amateur stargazing, go ahead and check out that article if you want to dive deeper into the subject. That is a wonderful expression. These have the advantage that the front section with the optics can be unthreaded and threaded on to the filter threads of a 1.25 inch eyepiece. Since it's such a popular eyepiece and allows for quality, planet-viewing, that makes it a great instrument for attracting newcomers to the hobby, especially children. You can do the calculation which will show that the 70 will have a significantly wider field of view as compared to the 52. If you would prefer to buy him $60 eyepieces or even $30 eyepieces because he is only 7 and he can upgrade later, that is also OK. We will talk more about the field of view later, but note that if you can use 2 eyepieces, you will typically only have one or two for very low power wide field views. Hi Ed, that is really helpful sorry if this is a daft question but is the baader hyperion 2 or 1.25 or can it be both? Save my name, email, and website in this browser for the next time I comment. Outstanding job Jack. If you plan to go longer than that you can get an AC adapter or a power tank. Omni 15mm Eyepiece - 1.25" Learn More. If we look at the range I provided above, we see that we could replace several eyepieces with one zoom. This is the link to the one I plan to buy as I know some others come with add ons: https://www.rothervalleyoptics.co.uk/baader-hyperion-mark-iv-8-24mm-universal-zoom-eyepiece.html, Thats great you had an XT8i that makes me feel confident I got a good telescope . I have used these in my F6 and F5 Dobs and find them a good value for the price. People may have heard, and rightly so, that Huygens or Ramsdens are crummy eyepieces and that they should get a Plossl instead, and they may believe the same applies to Kellners, but the truth is that Kellners are often good eyepieces. Since there are so many different types of eyepieces available on the market, choosing the right one for your situation can prove to be a harrowing task. Can you suggest the total . Many thanks, Sophie. Suggesting an F6 scope becomes an F18 would also imply things like reduced CA in a refractor. So we say that an F5 scope benefits from better corrected eyepieces more than the F10 scope. Plossl eyepieces are perfect for astronomical viewing because the field of view is wider. THANK YOU x 12! To achieve a maximum of 200X (2X the aperture of 100 mm), we solve for the focal length. https://telescopicwatch.com/celestron-8-24mm-zoom-eyepiece-review/. 20 = 90 = .8 Despite this, I also have some Plossls which are indispensable. Yes, Plossl eyepieces are some of the most popular with amateurs and professionals alike. The tradeoff was that each lens surface added another internal reflection, reducing contrast and adding glare. Plossls are the clear winner here in most cases, unless you have one of the wider-field 50-degree Kellners. As you saw in the article, they eyepieces that would be best for you, or your child, is based on your budget and what your goals are. However, I have eyepieces that have larger exit pupils than 7 mm and they work well. To achieve these benefits, they may use special glass and more costly manufacturing. If well made, Plossls are bright, with good contrast, and a flat field, and excellent sharpness. 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. They also offer a generous 16 mm of eye relief which is most important in the shorter focal lengths. High-quality Plssl eyepieces provide high contrast and sharpness across the entire field of view. Tip Its almost always cheaper to buy directly from Agena Astro. A key thing to remember is that eyepieces are universal. Remember that visual and AP have very different requirements, so plan on at least two different optical tubes. Later in the article, I will also give my top recommendations for both the best Kellner as well as the best Plossl eyepieces. Higher than 3X is usually reserved for astrophotography. These companies rebranded them under their own names. Of course, the entire eyepiece must be manufactured and finished correctly to realize the design's full potential. All are good eyepieces and diagonals, and would be excellent for star party use. The 4000 SWA's were way overpriced for their performance IMHO. Good 32mm Plssls run around $30-$40. The design uses a planoconvex, two cemented-element eye lens and a large convex field lens. Generally, dont mess around with solar projection unless youre okay with damaging the instrument. These are matters of individual preference and budget. All the rest will likely be 1.25. Does having a 70 vs 52 fov make a noticeable difference for double the price? But dont fear that you will waste your investment as eyepieces are standard sizes. A common problem are eyepiece kits, which are big boxes that some telescope suppliers will sell you with half a dozen eyepieces, most of which include annoyingly short focal length Plossl eyepieces. Any 1.25 diagonal should work. Age is not part of the equation. Worth it is a tough question to answer. If you are very demanding and must have the very best, this is where you want to be. Every new skill takes time. 8.5-ish mm (75x & 150x) Typically a Barlow does not add or subtract from this, but there again we have bad Barlows and Good Barlows. You will get varying opinions on this but I would not worry too much about this. A Plssl is probably as good as any 32mm eyepiece in a 1.25 inch focuser. A Plossl eyepiece has a lens thats plano-convex, which means it is flat on one side and convex on the other. Even if the scope comes with the more acceptable Kelner or . It should list what size eyepieces you can use. Good evening everybody. Plossl eyepieces have an eye relief equal to about 80% of their focal length. I currently own a Mak127 ( that can't use 2"eyepieces) and a 80ED ( that one can hold 2"eyepieces). A Plssl is probably as good as any 32mm eyepiece in a 1.25 inch focuser. Excellent article, thank you very much for taking the time to publish it. 1. Yes, eyepieces is a large and complex topic. The telescope comes with a 2x Barlow so I was thinking of getting one of the zooms you recommended. Since each eye has a different focal point, I suspect pulling the eyepiece out until reaching focus and then tightening the set screw. Thanks for going through the entire post. The field of view of the eyepiece has a few effects when it comes to actually using it in the telescope. They have good center sharpness but exhibit some field curvature and astigmatism. So I sincerely hope that this article helps you understand the similarities and differences between Plossl and Kellner eyepieces so that you can an informed decision and choose the best one for yourself. Choosing the most appropriate can completely change your experience in using telescopes. The Wiki article(s) were very good if anyone else is confused. That is up to you and your budget. And remember, when all else fails, read the instructions. The one exception I would keep in mind would be when working with Newtonian reflector telescopes below F5. What Does It Do. I have seen elsewhere discussions about the exit pupil of eyepieces. Some of these series also offer 2 eyepieces for telescopes that can accept 2 eyepieces. And that is pretty much what Super Plossl are today. Your email address will not be published. Again, does it create a more immersive viewing experience? Being a total novice, I love the StarSense app and technology. 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. Yes, the wider field of view of a Plossl is very helpful, but 40 degrees of Kellners isnt a soda straw (unless you are used to looking through very wide field eyepiece. We are a reader-supported organization. Plus the FOV expands as you zoom to the higher powers. In this article, were going to talk about what is a Plossl eyepiece, what are its components, how do they work, how many types are there and how youd buy a good Plossl eyepiece. However, because they have more glass elements than other designs, like Kellners, their manufacturing becomes extremely important to get high-quality optics. Fully coated with magnesium fluoride on every air-to-glass surface for excellent light transmission and high contrast views. Overall, I would highly recommend the goldline eyepieces. 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. That is why I suggest, if you can use 2 eyepieces, you will want one or two low power wide view 2 eyepieces. I would expect it to be similar to the Celestron in image quality. Disclosure - If you buy something via our link, we may earn a commission with no additional expense to you. 5-Minute Read, How To Increase The Magnification Of A Telescope; 5-Minute Read. As of the past couple years, it seems possible that the choice between Kellners and Plossls has been made for usyou either get what you get with your beginner telescope, or you will have to find a Plossl. Just give yourself some time to learn the app and to understand the scope. Between $100 and $250, I will call it mid-range. I purchased the Celestron Starsense 102mm refractor, focal length 660mm, stated highest useful magnification is 240x; it should arrive in about 2 weeks. Great article on eyepieces but I am still undecided exactly what eyepiece & Barlow to buy and from where since some buying sites dont provide all the info you cite in your article. Free shipping for many products! A standard Plossl eyepiece is typically between 20mm to 25mm but can range anywhere from 15mm up to about 40mm in diameter. Was $38.99 - $99.99 Now $31.19 - $84.99 Compare Orion Edge-On Planetary 1.25" Eyepieces How do you focus - I would have expected helical focusers in the eyepiece holders but don't see any? https://telescopicwatch.com/best-barlow-lens-and-how-to/, Celestron 8-24 Zoom Review 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. I want to help you select the best eyepieces for your budget and your telescope. Below .5 mm exit pupil, floaters in the eye become more apparent and can be bothersome. Edge sharpness is just satisfactory, nothing to boast about, as is the apparent field of view. But are they really? They are also good for those who have astigmatism because they are designed to be more forgiving with eye placement. Gold Line eyepieces also offer better eye relief than Plossl eyepieces, especially at the shorter focal lengths. You noted eye relief is important for those wearing glasses. That can only be shown through actual testing. I did sell them all when I adopted Dioptrx, and the Naglers are amazing! Telescopes Cost: Acceptable, Good, and Really Good Telescopes, Used Telescopes Buying Guide The Complete Guide, Different Types of Asteroids (C, S, and M) The Definitive Guide, Top 10 Night Sky Objects for Astronomy Beginners, Asteroid Mining Know Everything About It, German Equatorial Mounts (GEMs) Overview and Working. For the price, I think the eyepiece is still a good pick. Plossl eyepieces are very good and fairly inexpensive, typically between $25 and $50 each. You can use the same eyepiece on planets and deep-sky objects (DSOs). Plossls are available from many suppliers in a wide range of focal lengths in 1.25 and 2 sizes. Consider something between 35 and 40 mm in focal length with an AFOV of 65 degrees or wider for your lowest power eyepiece for your telescope. The Plossl eyepiece is a four-element design consisting of two doublets. Not only is it good to share the experience but you can get first-hand advice on things like diagonals and may even be able to try one in your scope to see if it makes a difference. My other eyepieces, ES and Meade 82 degree, stayed in the eyepiece case most of the time. The way a Plossl eyepiece works is by using the convex lens and concave lenses to create an image that has both total magnification of what youre viewing, as well as erect images. . Nice, thank you again for the additional inputs. Sorry but I am not offering a configuration and pricing service. This eye piece provides the maximum true field of view in the 1.25 inch format. You alluded to them, but you never mentioned Tele Vue. 14 = 128 = .6 Despite one being fundamentally superior to the other in terms of image correction, Kellners and Plossls are generally quite comparable in terms of the image you actually see. Our previous exchange convinced me to start out with an 80mm refractor. 17mm Plossl, unbranded, used, no caps, in bolt case; previous owner said it was a very good EP; $18 25mm Plossl, Orion Sirius, fully MgF2 coated on every air-to-glass surface; used; $23 (these are a step up from . 1.25" 6.3mm 32mm 40mm Plossl eyepiece set give you a good variation in magnification for a wide range of targets with extra sharpness and long eye relief. Lets look at the minimum. Im also uncertain about what to expect from an additional investment? 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. This was very useful, I got a meade infinity 90mm ( after read the review here -. If you had to choose 1 low-power 2 EP for chasing deep sky objects (again, at 600mm f7.5), what size piece would you go for? Plossl eyepieces have wider fields of view than Kellners. I also have an older smoothtop 20mm Meade 4000 that is also 5 element, and it is a fine eyepiece too, compared to another 20mm of the same vintage. I usually recommend a 32 mm Plossl type eyepiece as that provides about the widest view you can achieve with a 1.25 focuser. As long as you take good care of them, Plossls can last you a lifetime, and you will be able to use them with your next telescope if you upgrade at some point. Thanks, Angelo M. You picked a great first scope. I started with the Celestron zoom. 32 mm = 18.75X12 mm = 50X8 mm = 75X6 mm = 100X4 mm = 150X3 mm = 200X. SVBONY Direct . These are considered to be the least expensive eyepieces for serious astronomy and are offered in focal lengths from about 6mm to 40mm. What apparent field of view and eye relief do I want? I dont know if they make anything like this anymore, but as a kid, I had plastic slides with images on them (the Milky Way, Horse Head Nebula, etc.) 30 = 60 = 1.3 You can read a thorough review of Goldline eyepieces here. At one time Plssls were premium eyepieces. Just search on Astronomy Club and you will probably find one in your area. Take the AFOV of the eyepiece (provided by the mfg) in your case 82 degrees Its quite long but that is what we are aiming for and hopefully, it was useful to you. This is perfect for a 25mm Plossl (an extremely common standard) and downright luxurious with a 32mm Plossl, but when you get below about 12.5mm or 10mm, it can begin to get difficult to use. Wide view and well-corrected view, even in F5 scopes. Buy Astromania 1.25" 4mm Plossl Telescope Eyepiece - 4-Element Plossl Design .
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