If you are completely new to stargazing, Kellner eyepieces are absolutely fine. 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". 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. 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. 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. Both solutions offer somewhat similar mag-fov-er-price. For our experience level, would you recommend changing anything right now? It also gives the widest possible exit pupil in my dob and SCT, very handy when using nebula filters. At that price point, it couldnt compete with other 5-element devices like Erfle and Nagler eyepieces that had better performance. With an f/10 telescope, Plossls are as sharp as any other kind of eyepiece of the same focal length. Comparing to Plossl eyepieces, Super Plossl is somewhat better for astronomy. And, the quality of the eyepiece clearly comes into play here. Why not go back to the people who sold you the scope and get their help. It comes with 1.25 Plossls 25mm (26x) and 10mm (66x) eyepieces. 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. 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. The TFOV will be as wide as your 40mm Plssl, but with greater magnification and a slightly darker sky background. Then there is the rule of thumb to avoid duplicating focal lengths when acquiring eyepieces. And, in general terms, the higher the AFOV, the harder it is to make an eyepiece that will present a good image all across the field of view, which also drives up the cost. Those are significantly more expensive than the 1.25 focal lengths. 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. Ever since, I have been attempting to cram in every fact about the Universe, I can find into my head. Generally, dont mess around with solar projection unless youre okay with damaging the instrument. Fortunately, the investment can be leveraged with future scopes since eyepieces are standard sizes so they work in almost any telescope. I purchased the Celestron Starsense 102mm refractor, focal length 660mm, stated highest useful magnification is 240x; it should arrive in about 2 weeks. They have a pop-up eye guard and they are threaded to accept filters. We also joined our local Astronomy Club and look forward to joining others under the night sky when the opportunity presents itself again. Here we have very good eyepieces with some extra features. Gosky Plossl 40 mm Telescope Eyepiece - 1.25inch This is probably the worst eyepiece I can recommend. Our previous exchange convinced me to start out with an 80mm refractor. 1.25" Power mates with T ring adapter. Understanding and using a Barlow Lens Not really. You can email me also. Lets take a look. This Super Plossl design was better than regular Plossl eyepieces, but not by much. Thanks. This doublet design has an apparent field of view of 50-degrees or wider but can suffer from short eye relief making them difficult to use for some . But in this scope, the 32 mm doesnt work well. 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. 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. (Svbonys Plossls, for example, are optically identical to Orions Sirius Plossls). Wide view and well-corrected view, even in F5 scopes. I need your advice on it. For super Plossl eyepiece, the field of view is typically 40 to 60 degrees. The image quality is very good and the additional field of view and longer eye relief makes them very comfortable to use. No surprise there. This will become more apparent the wider the AFOV is of the eyepiece, in my experience. Orion Sirius Plossl eyepieces are ideal for any type of telescope; refractor, reflector, or catadioptic. For what it is worth, a slow scope like your CPC9.25 (f/10?) This series of eyepieces may provide better value in this price range. i still use the binos. One last thing, as a kid I used my telescope to watch squirrels and birds (which was interesting because the image was flipped around :-) so, you might consider getting an eyepiece that flips things the right way around so that navigating terrestrial nature is easier to manage. Yes, Plossl eyepieces are some of the most popular with amateurs and professionals alike. Explore Scientific, like many eyepiece providers, have higher-priced and budget lines. What Does It Do. Ive read reviews about my scope. These are matters of individual preference and budget. Then set your maximum based on your aperture and split it up. No results, please adjust your filters. I like my 38/70. Plossl telescope eyepieces are the most popular type of eyepiece on the market. And that is pretty much what Super Plossl are today. As I mentioned earlier in the article, not all Plossls are created equal, which simply means that there are good Plossls and then there are bad Plossls. A Plossl eyepiece has a lens thats plano-convex, which means it is flat on one side and convex on the other. Plossls are available from many suppliers in a wide range of focal lengths in 1.25 and 2 sizes. Each eyepiece gives you a unique magnification based on the formula listed at the start: Why do you need more than two eyepieces? Save my name, email, and website in this browser for the next time I comment. The Hexagon Zoom Eyepiece is made from durable plastic material that resists scratching and it has an eye relief distance of 15mm. A couple of them felt fancier, but the jump in performance was either insignificant or non-existent. A 20mm Plssl is probably worth it, if for no other reason than to compare the views it gives to the 21mm Hyperion you have. As we continue, what would you recommend adding first? Thanks so much. Brilliant article and I thank you for it, I was literally really confused prior to reading it. But, if you have a plan, you can fill in those slots, working toward a well-balanced set of magnifications. Dont worry about the math, as its simple stuff you can do with any calculator, on paper, or perhaps in your head. 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. They are not that expensive I would pay about $100 for both eye pieces. This number can range from 30 degrees to 120 degrees. So perhaps you do your line up like this. Is there much of a difference between the celestron and haader? Can you help me. A typical zoom eyepiece has a focal length range of 8 mm to 24 mm. However, some eyepieces have an eye relief as short as 5 mm. The Plossl's are very easy to modify, allowing me to use the bino-viewer on, all my refracting telescopes without having to cut down the tube length, p.s. So you ended up with: Not perfect to the edge but better than the Bresser, in my opinion. A 6mm Plossl has a tiny eye lens. A very good quality eyepiece for a reasonable sum. 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. 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. AP is all about the mount and accurate tracking. In the beginning, you are not going to know what the atmospheric conditions might be in your area. Plossls are the clear winner here in most cases, unless you have one of the wider-field 50-degree Kellners. the reality is that today's eyepieces are all quite good, particulalarly in an f/10 telescope. There are so many others at comparable or higher prices, many of which are quite good and some rather poor. Videos for related products. These lenses are connected together. Over time, you will likely spend more on eyepieces than on the telescope. Plossls cost a bit more than the Kellners as Plossls are expensive to manufacture because they require good optical glass and precisely matched concave and convex doublet surfaces to prevent internal reflections. The only reason it's in this list because of its price and a long focal point. Type above and press Enter to search. Comparing to Plossl, the Expanse eyepiece is a lot more expensive. 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. It also produces an erect image, meaning you see what youre viewing rather than seeing everything upside down or sideways as some types do. Of course, the entire eyepiece must be manufactured and finished correctly to realize the design's full potential. Or we say that F10 would be easier or less demanding on the eyepiece than the F5. Overall, I would highly recommend the goldline eyepieces. Plossls tend to come with large, ground-standing Dobsonians, whereas youre more likely to find a Kellner sold with a tabletop Dobsonian. This eyepiece was even better at correcting false color fringing, but because of internal reflections, the glare was even worse. Because of this setup, you might also hear a Plossl eyepiece referred to as a symmetrical eyepiece. Yes, eyepieces is a large and complex topic. 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. It has made learning the Constellations and star-hopping more fun and engaging for my whole family exactly what I was hoping for. 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. A 32mm plossl eyepiece and a 2x barlow lens should be enough to give you a good range of eyepieces for every use case. Celestron - 1.25" Eyepiece and Filter Accessory Kit - 14 Piece Telescope Accessory Set - Plossl Telescope Eyepiece - Barlow Lens - Colored Filters - Moon Filter - Sturdy Metal Carry Case. If you want a very good eyepiece with a bit wider field of view but are on a budget, these are very good choices. I just added the 4.7 mm. Lets give an example. They deliver sharp images in almost all telescopes. PayPal, cash, bank transfer are all acceptable. I am not aware of any such solutions for Newtonian reflectors. 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. Pentax K-70 Astrophotography: The Ultimate Camera on a Budget! 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. You can accomplish a longer eye relief by barlowing a longer f/l plossl, so that is something to think about as well. 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. How do you focus - I would have expected helical focusers in the eyepiece holders but don't see any? Also, as the apparent field of view gets wider, the image will require more correction. This wider field of view will make it easier to find your targets, allow you to view larger deep-sky objects, and provide a more immersive experience for everything that you view. Tip Its almost always cheaper to buy directly from Agena Astro. 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. Perhaps you should seek out help from your local astronomy club. Very often, those eyepieces will be in the outdated 0.965 format rather than the modern 1.25 or 2 diameter barrel format. A Plossl eyepiece is one of the most decent general-purpose eyepieces that are available on the market. Ive read, and re-read, and re-re-read this page. 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? Most likely it will be used as a loaner eyepiece to go with one of my two loaner telescopes. Tele Vue has eyepieces that approach $1000. For your application and the eyepieces you have or are going to get, you really dont need anything else. These will eventually be used in an 8in dob whenever it arrives. I have used both Kellner & Plossl eyepieces and a few others, and I can tell you that they all are quite different from each other in terms of the quality of the image that they produce. I would recommend the Orion Q70 series over that. The three-lens eyepiece that came out of this was much better at controlling false color fringing and other distortions, even in telescopes with short focal lengths. . They all work, but as you go up in price, you gain features or performance or both. I believe the 5000 UWA's are good as well. I have a 4 element (traditional) and a 5 element 32mm Meade, both from the same era in Japan, and the 5 element is much better by quite a bit. When discussing eyepieces, you will hear people comment on how well the eyepiece is corrected. 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. As said, they are cheap to compare. Again thank you very much for all the information in the page, excellent notes. The 66-degree AFOV of the Gold Line series provides a 32% wider field than Plossl eyepieces. Choose three focal lengths. These are the best in optical performance and build quality. Omni 40mm Eyepiece - 1.25" Learn More. My Baader Hyperion Zoom is my most used and favorite eyepiece. Besides fov, How would you compare the optical quality of the Celestron to the Baader? Sony A7III vs A7RIII Astrophotography: Which One to Shoot Infinity! Note that we also gained a 16 mm magnification at no additional cost. It is all about your budget, your goals, and your objectives, as outlined in the article. They are usable, but your eye will be extremely close to the top lens glass. If your scope uses eyepieces that are closer to 1, then you have an old style .965 that is now obsolete. 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. Again, this is more noticeable in lower focal ratio scopes. Plossl eyepieces have 4 lenses that are paired in two doublets. 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. Thanks for your comment. As for tabletop scopes, dont forget that you need a table, stool, or bench to place them. Can You See The ISS With A Telescope? Be sure to read the following as you consider your eyepiece purchases. The Big Bang Optics also participates in affiliate programs with Clickbank and other sites. 32 mm = 18.75X12 mm = 50X8 mm = 75X6 mm = 100X4 mm = 150X3 mm = 200X. NEW. short answer: yes. You will see these under many brands, including Orion, Celestron, GSO, and others. For astronomical observations, such as viewing craters on the moons surface from Earth, high-magnification models are preferred because they offer more detail. This can be debated 100 ways, but that is my advice. So save yourself this future unnecessary expense and just buy a Plossl. 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. If that is the case, it will give me another reasonably good, inexpensive zoom to recommend to beginners. Any 1.25 diagonal should work. 1. Rating (max 5): Excellent, thank you for the breakdown, very much appreciated. If you upgrade the telescope or add a second one, the eyepieces will work on that telescope too. SV207 30mm Super Plossl Eyepiece. 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. Cheap to try, and if you don't like it, easy enough to sell also. At least you'll have one budget eyepiece that will give you a larger part of the sky at low magnification. However, sometimes i am at the end of the range of the binocular focus adjustment. They also have good eye relief, making them comfortable to use for extended periods. Lets illustrate with an example using a 1200 mm FL telescope. I found an ES 70 degree AFOV 35mm eyepiece and am wondering whether I should get this or the Orion 38 70. I dont think so. Youd have to look into more complex designs which include a barlow lens, or simply use a longer focal length eyepiece with a quality barlow. 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. 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. Do you need to have the best to enjoy astronomy? I consider the Plossl to be the minimum standard for a good 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. I am a BIG fan of zoom eyepieces, especially if you dont have many. Note that the price categories are approximate, as prices can vary between retailers. I wont go into all the types of aberrations that can be there. This is why we recommend you try to locate the object first at low power, then use a higher magnification if you likethe wider field of view on the sky provides more context in terms of asterisms and reference stars and makes it more likely that youll catch the object you are looking for. What focal length eyepieces should I buy? I also have a 25mm plossl and am happy with that. I use some plssl eyepieces, since I still have quite a few in my kit, and yes, the others are correct. the shorter the focal length eyepiece = the shorter the eye relief. Kellner eyepieces work perfectly with small and medium-sized telescopes. Offered in both 2 and 1.25, these are excellent eyepieces. 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. 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. Also, note that the pricing is based on 1.25 eyepieces. no caps come in bolt case. IF you like your Hyperions , you could get a 2 inch visual back and 2 inch diagonal / or 2 inch SCT diagonal and add the 31 or 36 Baader eyepieces in 2 inch . I have seen some gatekeeping in this hobby about Kellners, and Im not sure I understand it. 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.
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