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The Big Bang Optics is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.com. 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. As we go up in price range, we gain capabilities that may not be immediately obvious. I am looking for as much as best I can buy. Plossls tend to come with large, ground-standing Dobsonians, whereas youre more likely to find a Kellner sold with a tabletop Dobsonian. PayPal, cash, bank transfer are all acceptable. If you are new around here and you want to get started with the hobby, check out our astronomy for beginners guide or the recommended gear page. 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. Plossls are extremely versatile and can be used for all use cases. When you use a Barlow lens with an eyepiece, you get the magnification, but the eye relief is not affected. They have a 50-56 degrees field of view, better eye relief, and cost more than Kellners. What happens if you use an eyepiece that has a the wrong exit pupil? I agree with your comment on zooms for kids. Or we say that F10 would be easier or less demanding on the eyepiece than the F5. The Wiki article(s) were very good if anyone else is confused. Now we have a maximum established. I have CPC 925 and I currently own Hyperion 10mm, Hyperion 17mm and Celestron plossl 40mm. Aspheric and Plossl Plossl are both lens designs that can be used in most telescopes. I found an ES 70 degree AFOV 35mm eyepiece and am wondering whether I should get this or the Orion 38 70. As a result, this can cause aberrations in the image as you move from the center of the view toward the edges. EP-mm = magnification = afov Because of this setup, you might also hear a Plossl eyepiece referred to as a symmetrical eyepiece. Whether it is cars or telescope eyepieces, there are inexpensive ones, upgraded models, and very expensive ones. In comparison, Aspherical lenses generally have no color distortion but might not work out well if the telescope user needs really high magnification. We may earn commissions by recommending products on this website. Each eyepiece gives you a unique magnification based on the formula listed at the start: Why do you need more than two eyepieces? On the inside, they are exactly the same design. Thanks in advance I really appreciate it! 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. Note to spectacle wearers: Plssl eyepieces with 15mm and longer focal lengths are good choices for spectacle wearers. However, the BH Zoom is by far my most used eyepiece. There is the 56mm Meade Plossl which magically turns my short FL refractors into their own finder scopes. Again, it only costs $30 to $40 to find out, so the education is not that expensive. . In essence the design differences between Kellner and Plossl comes down to the number of lenses within the eyepiece barrel. You can email me also. Lenses are fully multi-coated for excellent light transmission and reduced internal reflections. Be sure to read the following as you consider your eyepiece purchases. Visual astronomy is all about aperture, the more the better. Let us know in the comments if there is anything else you want to ask or share your thoughts on this post, always looking forward to feedback from others who will benefit from it as well! 20 = 90 = .8 High-quality Plssl eyepieces provide high contrast and sharpness across the entire field of view. However, I have eyepieces with much smaller exit pupils and they work fine. Heres the short answer Plossl eyepieces are generally better than Kellner eyepieces, but they also tend to be more expensive. Again, does it create a more immersive viewing experience? They deliver sharp images in almost all telescopes. Elena is a Canadian journalist and researcher. Achromatic vs Apochromatic refracting telescopes. Plossl eyepieces have a wider field of view that can go from 50 to 56 degrees. Best Telescopes For 10 Year Old Kids: Reviews and Buying Guide, The Complete Guide to the Planets You Can See With a Telescope, The Best Barlow Lenses: Reviews and Buying Guide. You can accomplish a longer eye relief by barlowing a longer f/l plossl, so that is something to think about as well. 5-Minute Read, How To Increase The Magnification Of A Telescope; 5-Minute Read. A wide-angle view of 66 degrees makes it perfect for viewing large objects and even entire constellations while still being able to focus on smaller details with ease. Lets just say that once you get below F5, it is really hard for the eyepiece to deliver a clean image to the edge. If you are just testing the waters or on a tight budget, get the Celestron, which is still pretty good. If youre still wondering between a Kellner vs Plossl, my advice to you would be invest a little extra cash and go for a good quality Plossl. PS. The 21mm is simply amazing, I can't believe that TV decided to discontinue this little gem, it is better than the newer version in every category including eye comfort, the overall shape along with fit and finish is one of the best from TV. These are things you will want to know and use. A 32mm plossl eyepiece and a 2x barlow lens should be enough to give you a good range of eyepieces for every use case. SV207 30mm Super Plossl Eyepiece. The image quality is very good and the additional field of view and longer eye relief makes them very comfortable to use. Wide view and well-corrected view, even in F5 scopes. Free shipping for many products! Omni Eyepieces | Celestron And since this article is intended as an aid to beginners rather than a rigorous optics lesson, I think the context I provided works well enough. Excellent, thank you for the breakdown, very much appreciated. 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. 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. The computerized pad and motor work on AA batteries which can last you a few hours. Celestron's 4-element Plossl eyepiece features include blackened lens edges to minimize internal reflection and maximize contrast, fully multi-coated optics for maximum light transmission. A Plssl is probably as good as any 32mm eyepiece in a 1.25 inch focuser. https://www.widescreen-centre.co.uk/explore-scientific-70-eyepieces.html. The only one not in the article is the Orion Q70 which is available in 38 mm, 32 mm and 26 mm. Goldline series of eyepieces provides the best value in this price range, better than Plossls. 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. Plus the FOV expands as you zoom to the higher powers. That is why I suggest, if you can use 2 eyepieces, you will want one or two low power wide view 2 eyepieces. Note that we also gained a 16 mm magnification at no additional cost. Field of view, is about finding, framing, drift time, and context. Kellner eyepieces were first designed by Carl Kellner in 1849. I generally use my 40 to search for DSOs so Ill probably replace that one at some point too. Kellner eyepieces use three glass elements in two groups to minimize color fringing. Plossls are the clear winner here in most cases, unless you have one of the wider-field 50-degree Kellners. Its quite long but that is what we are aiming for and hopefully, it was useful to you. Higher values are slower and lower values are fasterthis is a holdover from camera lens terminology and has to do with exposure times.). They are all made by the same OEM manufacturer. She has been looking at the sky for years and hopes to introduce more people to the wonderful hobby that is astronomy. You can build a full set of these with good results, but be aware of eye relief, especially if you wear glasses. Plossl eyepieces have an eye relief equal to about 80% of their focal length. If you have a longer focal length telescope, your shortest focal length eyepiece will be a higher number than what I have shown here. 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. You noted eye relief is important for those wearing glasses. Amazon.com : SVBONY SV137 Barlow Lens 1.25 Inch 2X Barlow Lens Metal This means you will be able to see a greater expanse for the objects in space but with fewer magnification levels than Kellner or Plossl lenses. Yes, Plossl eyepieces are some of the most popular with amateurs and professionals alike. These will normally be higher priced and may be outside the price range we show here. When I started, I purchased less expensive eyepieces to learn about them and how I would use them. 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. > Click here to jump to the Best Eyepieces section. did i pass? Most likely it will be used as a loaner eyepiece to go with one of my two loaner telescopes. A Plossl eyepiece lens provides more eye relief than anything else out there! Vixen NPL Eyepieces | First Light Optics Some of these series also offer 2 eyepieces for telescopes that can accept 2 eyepieces. Customer reviews Average Rating (16 Reviews): Write a Review and share your opinions! Centuries of improvements led to achromatic refractors, where the primary lens is made up of two lenses of different types of glass, which reduces false color fringing and allows the telescope to be made considerably more compact. As a kid, I loved looking at the moon (which can be seen any time of day, regardless of ones bedtime) so make sure that the field of view is wide enough to see the whole shebang. My 20, 26, and 32mm Plossls will probably stay around. In the early days of telescopic astronomy, refractor telescopes were designed with a single lens at the front and a single lens at the back. 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. OK that makes sense, many thanks. A Barlow lens will not reduce the CA in a low FR achromat refractor so to speak of it changing the focal ratio would, I think, introduce confusion in most situations. 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. Kellner vs Plossl eyepieces for dobsonians? : telescopes - reddit You are looking through a LOT of atmosphere which distorts the image. 14 = 128 = .6 They are all 4-element Plossl eyepieces, and most have a 52-degree field of view that is common to the Plossl design. Lets take a look. Think of these as your Ford, Chevy, and Toyota of eyepieces. In general terms, the higher the AFOV number, the more the eyepiece will cost. The focal length range for 1.25 Plossls is about 6mm to 45mm. They have a narrow AFOV but have a reputation for being very sharp.. Thanks for your comment. As we go along, I will refer back to these, so dont worry if you cant answer the questions or understand the formulas now. They also have good eye relief, making them comfortable to use for extended periods. But dont fear that you will waste your investment as eyepieces are standard sizes. Best suited for telescopes with f-ratios f6 or slower. Warranty Limited Warranty against defects in materials or workmanship for one year from date of purchase. Tele Vue offers several series with apparent fields of view from 50 degrees to 120 degrees. I had a newer - purchased in 2016 Meade 32mm (white lettering) that was no better than the older 32mm 4000. The longer FL Plossls (>15mm) have some distinct advantages over more complex designs without the major disadvantage of Plossls which is short ER. Cheap to try, and if you don't like it, easy enough to sell also. Other brands have joined and have used the Super Plossl label, but they all keep the original 4-piece design. Orion Sirius Plossl 10mm telescope eyepiece 1.25" in very good to excellent 185794462395 In most cases, these are eyepieces that are focused on wider AFOV or better correction for low focal ratio scopes. Kellner eyepieces, on the other hand, are generally pretty close to each other in terms of quality so theres little chance you will get much variance in image definition between brands. This may be enough for many eyeglass wearers. They have decent eye relief and little curvature of field. For astronomical observations, such as viewing craters on the moons surface from Earth, high-magnification models are preferred because they offer more detail. I have Celestron and the Baader Hyperion. I also really liked my E-Lux 32mm, a Kellner. You see the object in a wider expanse of space with more stars. So save yourself this future unnecessary expense and just buy a Plossl. but the meat of the article is about understanding the considerations and specifications to know when selecting eyepieces. https://telescopicwatch.com/orion-skyquest-xt8-intelliscope-review/. The basic design hasnt changed much, but the real costs of manufacturing have dropped. Take the AFOV of the eyepiece (provided by the mfg) in your case 82 degrees The Plossl eyepiece has 4 lenses, consisting of 2 identical double lenses. However, some eyepieces have an eye relief as short as 5 mm. Gosky 1.25inch Plossl Telescope Eyepiece - Amazon.com In simple terms, high focal ratio scopes, say those over F6, tend to be less demanding on eyepieces than those below F6. This will give you a maximum target for planning purposes. Now you can get good eyepieces for under or around $50. Thank you so much for taking the time to provide all this information! Plossl eyepieces have an eye relief equal to about 80% of their focal length. Then there is the rule of thumb to avoid duplicating focal lengths when acquiring eyepieces. 8.8 = 240 = .34 I am very near-sighted, barely see the big E on the vision chart without glasses. In some cases, the eyepieces are waterproof to protect them from internal contamination caused by heavy dew conditions. It appears to be a custom-made 90 degree binocular built from two 90 degree diagonals and binocular-size objectives attached in place of the usual OTA. My Meade 4000 56 and 60 degree Meade Plossls are pretty sharp to my eyes and do pretty well for me. 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! A Barlow lens is an optical device that goes between the eyepiece and the focuser. If you read the article you know how to calculate the magnification and field of view. I have the 38 mm and recommend it often. When selecting the best eyepiece for you, consider: Eyepieces are standardized so whatever investment you make today, the eyepieces will continue to serve you in any future scopes you may own. Then you can judge for yourself if it is worth it. Today, most beginner telescopes of any quality are sold with either Kellner or Plossl eyepieces. However, because they have more glass elements than other designs, like Kellners, their manufacturing becomes extremely important to get high-quality optics. Sirius Plossls offer a 52-deg apparent field of view for clear, sharp images. I really enjoy usingPlssls. 600 mm / 200X = 3 mm This will be the focal length of our highest power eyepiece. I just ordered Hyperion 13mm and 21mm but I really like how sharp and crisp view is in plossl 40mm. very happy. In your case, I would do this for the 30 and the 20. And new proprietary designs come out from time to time. Astro Essentials Super Plossl Eyepiece | First Light Optics Plossl eyepieces are great. 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. The ES is actually slightly cheaper than the Orion but my understanding from your reviews and replies is that ES might actually be the better eyepiece have I got that right? I loved my Baader Mark-IV 8mm-24mm Zoom+Barlow combo in my 8" EdgeHD. Excellent article, thank you very much for taking the time to publish it. 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. Such eyepieces are able to offer great performance, i.e., satisfactory degrees of deviations, to about a 50.degree field. Not all are Plossls, but excellent eps at f/10. In this article, we will only focus on the differences between Plossl and Kellner eyepieces. This is a good thing, because normally the shorter the focal length of the eyepiece, the less eye relief you have. SVBONY Telescope Eyepiece Set Telescope Accessory Kit with 2x Barlow L Us big kids like zooms too. The magnification and field of view is the same as a 10 mm eyepiece (AFoV being unchanged) in a 600 mm telescope but the eye relief is that of a 30 mm eyepiece. 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. This eyepiece was even better at correcting false color fringing, but because of internal reflections, the glare was even worse. If your focuser/diagonal will accept 2 eyepieces, then I will suggest you get one or two 2 eyepieces for your low power wide view eyepieces. And remember, when all else fails, read the instructions. It also was considerably more expensive. The tradeoff was that each lens surface added another internal reflection, reducing contrast and adding glare. A super Plossl eyepiece is a top-performing eyepiece that can be used for a variety of tasks, from viewing objects in the distance to looking at microscopic things. Fortunately, the investment can be leveraged with future scopes since eyepieces are standard sizes so they work in almost any telescope. . Compared with a zoomable telescope eyepiece, they are pretty much the same in terms of the quality of the image. SVBONY Eyepiece Review: Take Your Stargazing Up a Notch Eye relief is the distance from the eye lens to your eyeball, and the higher the better (within reason). However, if you want to optimize your viewing experience, youll need to invest in a better-quality eyepiece. There is always more to learn but it helps if you go in with a good base understanding, and that was my goal. But you need to know, first, if you will be wearing glasses when you observe. I guess my curiosity is mostly about the diagonal. The eye relief is the distance between your eyes and the eyepiece where you are able to view the whole image comfortably. Over time, you may wish to add a specialty eyepiece here or there, but I would not make that a priority until you have filled out your magnification range. A couple of them felt fancier, but the jump in performance was either insignificant or non-existent.