Apparent Field of View: This is a measure of how wide a view the eyepiece will provide as compared to alternate eyepieces. If you look up transparency and seeing in the context of telescopes you can learn more about how atmospheric conditions will affect what magnifications you will choose on any given night. Most modern telescopes use a focuser, or diagonal, that accepts 1.25 eyepieces. I have several 10mm eyepieces in my eyepiece boxalmost all of them are eyepieces that came with some telescope I boughtand I will almost always choose to use one of the Kellners over one of the Plossls, because the Kellners have a longer eye relief, which is comparable to the focal length. My Barlow is a 2X with a removeable Barlow element that can be screwed right onto an eyepiece giving a 1.5X effect. Glad you found it helpful. But the difference in price to get to the next level is high, and the performance difference may be small. Why two sizes? But those EPs mentioned were all great too! 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. It costs three to four times as much as the Celestron Zoom, but if you have the budget, this is the one to get. In High School, they told me that F=MA In college I learned that F=dp/dt But F=MA works well enough for most situations and that is how I think of it. 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. With your glasses on, you simply cant get your eye close enough to an eyepiece that only has 10 mm of eye relief. If you do not have your Hyperions yet I recommend you wait until you have these and try them out before you buy the Plossls. In my opinion, you do not. 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. With the XT8i I usually used the zoom configured with a 1.5X Barlow giving me a 75X to 225X which I found to be nearly perfect for that scope. (Compare, for instance, 20mm of each type, or 10mm of each type.) But you need to know, first, if you will be wearing glasses when you observe. There are inexpensive adapters that will let you use standard 1.25 eyepieces in a .965 focuser/diagonal. A couple of them felt fancier, but the jump in performance was either insignificant or non-existent. I also like to have my face physically in contact with the eyepiece (or the eyepiece cup) so the tight eye relief of the shorter focal lengths actually works really well for me. As you learn more about astronomy and you gain more experience with time, you may want to move to Plossls or even higher-quality eyepieces. Overall, I would highly recommend the goldline eyepieces. 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. Some optics brands have taken the next step and launched some eyepieces they have labeled as Super Plossl. All of the Omni eyepieces have a 1.25" barrel size with the exception of the super low power 56 mm, which has a barrel size of 2". I dont have a specific diagonal to recommend and I am not aware of any specific issues with the one that is included with the scope. They are all made by the same OEM 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. 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. 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). Well-made lenses are expensive though, so in general the more lenses, the higher the price of the eyepiece. Despite this, I also have some Plossls which are indispensable. 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. If you read the article you know how to calculate the magnification and field of view. One of the main drawbacks of this eyepiece, though, is the eye relief. I have not had an opportunity to test it yet but the general discussions have favorable. A large field lens makes the ocular easy to look into. If you are going to wear your glasses when you observe, you want at least 18 mm of eye relief and 20 mm is better. There are certainly much better options out there but at a significant cost. So, I think it worth your while to try the Plssls. Heres the short answer Plossl eyepieces are generally better than Kellner eyepieces, but they also tend to be more expensive. But with 2 eyepieces and a Barlow, you have the full effective range of your telescope. Where a difference can show up is that a lower number focal ratio scope will make it harder for an eyepiece to provide a uniformly good, in-focus image all the way across the field of view due to the steeper angle that the light arrives at the edges of the eyepiece with a low focal ratio scope, as compared to a high focal ratio scope. Once I knew how much I liked the zoom I upgraded to the Baader Hyperion Zoom. The zoom can be used with any 1.25 focuser too. Warranty Limited Warranty against defects in materials or workmanship for one year from date of purchase. Theres a reason Plossls are usually kept at 52 degrees. Tele Vue offers several series with apparent fields of view from 50 degrees to 120 degrees. The Plossl eyepiece is a four-element design consisting of two doublets. https://www.widescreen-centre.co.uk/explore-scientific-70-eyepieces.html. Aspheric and Plossl Plossl are both lens designs that can be used in most telescopes. now it all makes sense, you did a great job explaining all this information it was a lot to take in but i have it now. That is why I suggest, if you can use 2 eyepieces, you will want one or two low power wide view 2 eyepieces. I also have a 25mm plossl and am happy with that. If you wish to find a short-focal length eyepiece with a longer, more comfortable eye relief, you could use a long-focus eyepiece with a separate, high-quality barlow lens (an achromatic or apochromatic fully multi-coated barlow would be necessary), or you could purchase one of the several designs incorporating a smyth/barlow lens into the eyepiece design. Thanks for a very helpful guide. However, you may see them at higher prices for the short term. Yes, Plossl eyepieces are some of the most popular with amateurs and professionals alike. 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 . Most telescopes come with one or two eyepieces. Also work very well with my binoculars that have removable focal reducers built into. They are not that expensive I would pay about $100 for both eye pieces. I once had to use a 6mm Plossl to attempt to perform a star-test collimation for a telescope at the observatory. 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. My understanding of eyepieces was very limited until I read this article, you explain things in a clear and understandable way which made my understanding so much clearer. Ive added comments on where you may find and use them. Here we have very good eyepieces with some extra features. They are just OK, but I dont recommend them, especially in a low focal ratio scope. I believe the 5000 UWA's are good as well. Edge sharpness is just satisfactory, nothing to boast about, as is the apparent field of view. Typically, these will be 25 mm and 10 mm or something close to that. They all work, but as you go up in price, you gain features or performance or both. I want to help you select the best eyepieces for your budget and your telescope. However, if you want to optimize your viewing experience, youll need to invest in a better-quality eyepiece. Other brands have joined and have used the Super Plossl label, but they all keep the original 4-piece design. So its best for use during duller times when there isnt much brightness visible. Im also uncertain about what to expect from an additional investment? Youll find yourself adjusting these type of factors less than. Super Plossls offer a smaller field of view, which makes them good for close-up views and examining small objects. So perhaps you do your line up like this. Plssl's were top of the line at one time, and are still being sold today, so that says something too. This is a fairly inexpensive zoom that I wanted to try. The Big Bang Optics was started because of our love for astronomy and to help others like us find the best telescope and accessories. Quality this good usually costs a lot more. You are talking about the technical details of how a Barlow works, and I agree. Today, most beginner telescopes of any quality are sold with either Kellner or Plossl eyepieces. 2x Barlow You probably dont need to worry about upgrading them as soon as you get your telescope, unless you can see an optical problem in the one youre using or you find the short eye relief for the short-focus eyepiece uncomfortable. Look at the apparent field of view specs and understand what this means for the field of view. 20 = 90 = .8 When discussing eyepieces, you will hear people comment on how well the eyepiece is corrected. The Celestron Omni Plossl eyepiece range offers a nice entry-level range into the higher quality 4-element Plossl design. This will become more apparent the wider the AFOV is of the eyepiece, in my experience. To achieve these benefits, they may use special glass and more costly manufacturing. Inexpensive Plossls that are manufactured using low-quality lenses are susceptible to internal reflections when viewing bright objects at high magnification. Most likely it will be used as a loaner eyepiece to go with one of my two loaner telescopes. Question: would an 18mm Baader Classic Ortho mostly used for Moon and planets loose sharpness and contrast if used with a short F5 telescope like the Celestron Astro-Fi 130? Or, you may find that you like the 8 mm and 6 mm used with the Barlow and can avoid the expense of two eyepieces. So plan this into such a purchase. Required fields are marked *. Eye relief of less than 10mm gets really uncomfortableyou tend to rub your eyepieces against the eyepiece or lens, and you have to hold your eye at just the right distance to keep from touching the lens. Its made up of four lenses in two groups. It may be a bit less than that in reality but for practical purposes that is close enough. A 32mm plossl eyepiece and a 2x barlow lens should be enough to give you a good range of eyepieces for every use case. Whether it is cars or telescope eyepieces, there are inexpensive ones, upgraded models, and very expensive ones. Looking from different sorts I found the Baader Aspheric 31mm and 36mm.these two eyepieces allow me to switch between 2" and 1.25"just by changing the barrel. I also just bought the Celestron Starsense 102mm refractor (650mm focal length, f/6.5) as a first scope for me and my kids. I agree with your comment on zooms for kids. None of my fancy EPs have enough contrast for this application. At shorter focal lengths they have less eye relief, and at all focal lengths they have a narrower field of view, than newer types. These lenses are connected together. Plossls are extremely versatile and can be used for all use cases. What focal length eyepieces should I buy? Was compairing the Apertura standard 15mm Plossl with their 15mm super wide angle eyepiece (70 afov). Hi Ed, My friend has one and he really likes it, and it is his third telescope. But what are the other differences? These companies rebranded them under their own names. If money is not a concern, you cant go wrong with Tele Vue eyepieces, any Tele Vue eyepieces. Videos for related products. Now we have a maximum established. Tip Its almost always cheaper to buy directly from Agena Astro. I couldnt find any suggestions on your site about diagonal recommendations. 4mm Eyepiece vs 20mm Eyepiece. They have a narrow AFOV but have a reputation for being very sharp.. ES 82 degree series plus 1 meade uwa @20 mm with 1800 focal length optical tube lowest mag 51 x / highest mag 300. Not perfect to the edge but better than the Bresser, in my opinion. Now looking for a couple of decent eyepieces. Plossls provide very good eye relief for eyeglass wearers in focal lengths of about 25mm and longer. Ive read, and re-read, and re-re-read this page. You really understood the material. Kellner and Plossl- both are two different types of eyepieces for telescopes. If you are very demanding and must have the very best, this is where you want to be. Thinking in a super ploss 32mm and maybe something between 9mm and 15mm . Just start with 32 mm for your low-power eyepiece. In my scopes a simple zoom eyepiece like the Celestron 24-8mm or the Baader has replaced the higher powered plossls. They also offer a generous 16 mm of eye relief which is most important in the shorter focal lengths. . The field of view of a p Plossl eyepiece is typically 60 to 120 degrees. short answer: yes. Those are significantly more expensive than the 1.25 focal lengths. The only difference is that they have a different design as well as a shape with their lenses, which affects the magnification of your telescope view. Features : 5 superior-grade Plossl eyepieces: 1.25-in, 4-element design with a 52 AFOV (32mm has 44)4mm, 6mm, 9mm, 15mm, and 32mm . Perhaps you have read about planetary eyepieces, DSO eyepieces, and other types of specific eyepieces. So, for your 30 mm, 82/60 = 1.36 degrees. You can read a thorough review of Goldline eyepieces here. (Focal ratio is a term that refers to the telescopes focal length divided by its aperture. A key thing to remember is that eyepieces are universal. Plossl eyepieces are great. Are there any good low-cost 2 EPS out there? It will also make your life easier if youre out observing on windy days that would otherwise blow off the front cover of your telescope. Save my name, email, and website in this browser for the next time I comment. The big problem with Plssls is that the eye relief is about 0.75 times the focal length. Not all are Plossls, but excellent eps at f/10. 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. Understanding and using a Barlow Lens 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). In this case, I am going to define this by the focuser and eyepiece size. 100-300X, 2X Barlow. I have seen elsewhere discussions about the exit pupil of eyepieces. None of my fancy EPs have enough contrast for this application. You have to decide how fussy you are about the edges and what your budget can tolerate. A Televue Plssl may be better than a generic one, but the difference is probably not worth the additional cost. They are usable, but your eye will be extremely close to the top lens glass. This series of eyepieces may provide better value in this price range. As said, they are cheap to compare. Plossl eyepieces are very good and fairly inexpensive, typically between $25 and $50 each. Kellner eyepieces work perfectly with small and medium-sized telescopes. Kellner eyepieces have 3 lenses cemented together and have a 35-50 degree field of view. Orion Sirius Plossl 1.25" eyepieces are ideal for all types of telescopes: reflector, refractor, and catadioptrics such as Maksutov-Cassegrains. Remember that visual and AP have very different requirements, so plan on at least two different optical tubes. So, I am going to organize the guide around five questions and four formulas. What should one opt for a 2 EP over a 1.25? This has nothing to do with your scope or eyepiece. Every new skill takes time. At that price point, it couldnt compete with other 5-element devices like Erfle and Nagler eyepieces that had better performance. The biggest advantage is much better ER in a large ocular. 50 150X, no Barlow Kellner eyepieces were first designed by Carl Kellner in 1849. It all comes down to cost-benefit. That is a wonderful expression. Thanks so much. But for the targets requiring higher mag Im still undecided between: the reality is that today's eyepieces are all quite good, particulalarly in an f/10 telescope. Major telescope brands such as Celestron supplies Kellner eyepieces with their r least expensive telescopes and still may. The 26 and 32 are usually the first ones I reach for. These tend to run toward the more expensive price range. The larger barrel allows them to create an eyepiece with a higher AFOV. Omni 15mm Eyepiece - 1.25" Learn More. So we say that an F5 scope benefits from better corrected eyepieces more than the F10 scope. 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. The only one not in the article is the Orion Q70 which is available in 38 mm, 32 mm and 26 mm. Many brands of eyepieces are available, including SVBony UltraWide, Astromania UltraWide Angle, Agena Astro StarGuider Enhanced UltraWide Angle and others. I have the 38 mm and recommend it often. A Plossl eyepiece has a field of view thats very wide, so if youre looking at the full moon or some other object in space with it, chances are youll see the entire thing. The Wiki article(s) were very good if anyone else is confused. 1200 mm FL scope / 10 mm FL eyepiece = 120X, 40 degree AFOV / 120X = .33 degrees (less than 1 full moon wide), 60 degree AFOV / 120X = .5 degree FOV (about one full moon with no space around it), 82 degree AFOV / 120X = .68 degree FOV (about one full moon with a star field around it to frame it). Plossl eyepieces have 4 lenses that are paired in two doublets. You have a very wide choice of brands and styles to choose from. They are referring to how much or how little distortion is visible as you look from the center of the image out toward the edge. 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. You are asking about a very specific eyepiece in a very specific scope combined sometimes with a Barlow. For modern eyepieces, the differences between Plossl and Super Plossl is going to depend on the manufacturer. Hi, I have recently bought a Orion XT8 and am trying to work out which eyepieces to add to what is provided with the scope. You also get 7 1.25 filters which include the following, #80A Blue Filter, #58 Green Filter, #56 Light Green Filter, #25 Red Filter, #21 . I must say Im quite confused about eyepieces. Despite the narrow field of view and short eye relief, it showed shockingly good views of Saturn, Jupiter, and even the Moon. 1. A Kellner eyepiece has 3 lenses, while a Plossl has 4. 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. So save yourself this future unnecessary expense and just buy a Plossl. Do you need a 10 mm planetary and a 10 mm DSO eyepiece? There is one aspect in which a Kellner can actually outperform a Plossl: eye relief. Imagine you are looking at the moon with each of these eyepieces and consider what you would see. The third choice of eyepieces is the Orion 12 mm Sirius Super Wide Angle Correct Image Eyepiece. The sharp/crisp view you get from your 40mm Plossl comes down to the relatively low magnification it provides. While it covers the same range as the Celestron zoom, it offers better optics, better mechanical operation, and a wider field of view. No price limit? But, at least get the 32mm Plssl. 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! thanks for all your help. Come join the newest, most engaging and inclusive astronomy forum geared for beginners and advanced telescope users, astrophotography devotees, plus check out our "Astro" goods vendors. Conclusion. Some of these series also offer 2 eyepieces for telescopes that can accept 2 eyepieces. They include links to them where they can be ordered. 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. The Hyperions work well in SCTs and you can't beat that large eyelens and eye relief ,JMO. Such eyepieces are able to offer great performance, i.e., satisfactory degrees of deviations, to about a 50.degree field. i didnt have all this simply-put information when i bought my orion st-80 as my christmas present to myself in 2020. i started out with several pair of binoculars i bought used off ebay, then bought the scope. If your scope uses eyepieces that are closer to 1, then you have an old style .965 that is now obsolete. Simple Plosels work well and unless you have money burning a hole in your pocket, I would start with simple affordable eyepieces. This SVBONY eyepiece review should get you up to speed with the budget stargazing options. 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. We are a reader-supported organization. Pay attention to the eye relief, especially if you will be observing with glasses. For example, if you put a 30 mm eyepiece in a 3X Barlow, it will triple the magnification you get from that eyepiece. For super Plossl eyepiece, the field of view is typically 40 to 60 degrees. If you want to observe the fine details of a specimen, Plossl eyepiece has a higher magnification than an ocular with lower lenses. However, Orion has managed to make one that is quite compatible with most styles of telescope. Be sure to read the following as you consider your eyepiece purchases. . This general purpose design gives good colour correction and an adequate feld of view at reasonable cost and they are often bundled with new telescopes. For the price, I think the eyepiece is still a good pick. Plus the FOV expands as you zoom to the higher powers. The eye relief is the distance between your eyes and the eyepiece where you are able to view the whole image comfortably. 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. I really enjoy usingPlssls. It also was considerably more expensive. I am very interested in viewing Nebulae do you think this set up will work well for that or do I need other eyepieces or filters? Im fairly picky so would extend budget for better eyepieces if its worth it. You will see these under many brands, including Orion, Celestron, GSO, and others. Le migliori offerte per Celestron 1,25 pollici Omni Plossl telescopio astronomico britannico 32 mm J8R6 sono su eBay Confronta prezzi e caratteristiche di prodotti nuovi e usati Molti articoli con consegna gratis! Learn more about our story and the team behind the scene. I have an F4 Newtonian reflector and if I use an eyepiece of longer than 25 mm, an exit pupil of 6.25, I start to get a dark area in the center of the field of view which is a shadow of the secondary mirror. Which is Stronger? The longer FL Plossls (>15mm) have some distinct advantages over more complex designs without the major disadvantage of Plossls which is short ER. Astrophotography with Nikon D3200: Can It Be Better? The downside to this type of lens is that they can cause chromatic aberration which creates colored spots around bright objects such as planets or stars due to the different wavelengths not going through equally. Poorly chosen eyepiece might give you poor experience and sometimes even make stargazing difficult. These sizes have become the industrys standard sizes. In essence the design differences between Kellner and Plossl comes down to the number of lenses within the eyepiece barrel. Thank you so much for taking the time to provide all this information! I have to say that your questions are answered in the article. I dont own nor have I used it, but Orion has a very good reputation. Do you have any additional comments to help me? a breath of fresh air! A Plssl is probably as good as any 32mm eyepiece in a 1.25 inch focuser. 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.



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