Worth it is a tough question to answer. Most people will be fairly comfortable with eye relief of 12 mm or higher. OK that makes sense, many thanks. There was an old Meade Super-Plossl design that used an additional lens element and could reach a wider field of view. Then there is the rule of thumb to avoid duplicating focal lengths when acquiring eyepieces. Just give yourself some time to learn the app and to understand the scope. But what are the other differences? The price can run to over $1000 per eyepiece. Yes, eyepieces is a large and complex topic. Here are a few types of eyepieces you may read about and their typical AFOV. I still have it and still use it from time to time. They also offer more eye relief than Plossls at the shorter focal lengths. How Good Are Super Plossl Eyepieces for Astronomy? PS. You can email me also. Ive added comments on where you may find and use them. In essence the design differences between Kellner and Plossl comes down to the number of lenses within the eyepiece barrel. With your glasses on, you simply cant get your eye close enough to an eyepiece that only has 10 mm of eye relief. That is the critical factor. Stargazinghelp.com is a knowledge hub for professional and amateur astronomy and astrophotography enthusiasts. As a result, this can cause aberrations in the image as you move from the center of the view toward the edges. A Plssl is probably as good as any 32mm eyepiece in a 1.25 inch focuser. Some include: Parks Gold Series, Celestron Ultima's, Meade Series 4000 Super Plssls (depending on year / origin / style) and a few others that I don't remember. Plssl eyepieces are affordable and they're outstanding additions to amateur telescopes. Later in the article, I will also give my top recommendations for both the best Kellner as well as the best Plossl eyepieces. At 32mm, a Plssl will give you as wide a field of view as any 1.25mm eyepiece can. Most modern telescopes use a focuser, or diagonal, that accepts 1.25 eyepieces. 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. 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. Plus the FOV expands as you zoom to the higher powers. Now we just divide it up and fill in some sample focal lengths. I often recommend the use of a barlow to achieve the higher range of magnifications. If you plan to go longer than that you can get an AC adapter or a power tank. The TFOV will be as wide as your 40mm Plssl, but with greater magnification and a slightly darker sky background. But those EPs mentioned were all great too! I just added the 4.7 mm. 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. This was my first zoom eyepiece and the one that caused me to fall in love with zoom. I would suggest you also get a 2 low power wide view. The Plossl design has become the mainstay of the modern ocular business and probably represents the best value in terms of performance and price, especially in medium and long focal lengths. 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 must also warn you that some of these bad Plossls may actually turn out to be worse than any run-of-the-mill Kellner. I am not aware of an ES branded 70 degree series in the USA, but they do have a Bresser branded 70-degree series. 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. 50 150X, no Barlow https://telescopicwatch.com/best-telescope-eyepieces/. Plossl eyepieces have an eye relief equal to about 80% of their focal length. I guess my curiosity is mostly about the diagonal. 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. If your focuser/diagonal only accepts 1.25 eyepieces, I would recommend you use a 32mm as your longest focal length, lowest power eyepiece. But will the Baader CO with 1.5-2-3x Barlows deliver a visibly sharper and more contrast view of the Moon and planets than the zoom lens with a 2x Barlow, to compensate for the zooms convenience that is the question! Is it just about finding and framing, or do wide fov EPs create a more immersive experience? 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. Plossl telescope eyepieces are the most popular type of eyepiece on the market. If you have a longer focal length telescope, your shortest focal length eyepiece will be a higher number than what I have shown here. What should one opt for a 2 EP over a 1.25? 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. Every new skill takes time. The result in magnification is the same and the eye relief associated with the eyepiece is retained or, in some cases, actually lengthened a bit. Or take one of your eyepieces and measure across the bottom of the barrel. Focus on the magnifications rather than the mm of the eyepieces. I have since moved up to a 12 Dob but I use the same eyepieces and the BH Zoom continues to be my most used. As Im sure you know, a Barlow actually narrows the cone of light that enters the eyepiece, hence it affects the apparent focal length and thus the f/ratio of the telescope objective. No price limit? They are all made by the same OEM manufacturer. Plossl eyepieces have a wider field of view that can go from 50 to 56 degrees. But you need to know, first, if you will be wearing glasses when you observe. At one time Plssls were premium eyepieces. The BH zoom is optically a 1.25 eyepiece. To achieve a maximum of 200X (2X the aperture of 100 mm), we solve for the focal length. 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. If you want to buy him $200 eyepieces so he can grow into them, that works. 6mm Kellner eyepiece that I enjoyed a lot. I have an SCT and my eyepiece case only hasPlssls (and one Ortho) in it. https://www.amazon.com/Orion-8829-Wide-Field-Telescope-Eyepiece/dp/B000M89H7C/ref=sr_1_2?dchild=1&keywords=Orion+Q70&qid=1606584502&sr=8-2, The Explore Scientific 68 degree series would be better but at a much higher price. By default, expect a 40-degree field of view in a Kellner and a 50-52 degree field of view in a Plossl. These will normally be higher priced and may be outside the price range we show here. 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. 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. Explore Scientific recently extended this offering by adding a series of 82 degree eyepieces labeled LER, or Long Eye Relief. dnrmilspec is right. This will give you a maximum target for planning purposes. When I started, I purchased less expensive eyepieces to learn about them and how I would use them. I cant answer that specifically as I have no experience with that eyepiece in that scope. The design uses a planoconvex, two cemented-element eye lens and a large convex field lens. I beleive this is the same as they ones you asked about. Pentax K-70 Astrophotography: The Ultimate Camera on a Budget! I have Celestron and the Baader Hyperion. 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. That said, I should also tell you that not all Plossls are created equal. Press Esc to cancel. a Celestron 8-24 Zoom with a 2x Barlow 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. She has been looking at the sky for years and hopes to introduce more people to the wonderful hobby that is astronomy. Goldline series of eyepieces provides the best value in this price range, better than Plossls. There is one aspect in which a Kellner can actually outperform a Plossl: eye relief. The more light that is gathered, the more magnification that can be applied to the image, up to the limits that are imposed by the atmosphere. I can recommend these with confidence. Interesting points Philip. It had one of the best fields, edge to edge, in my SCT that I've ever seen. Thanks. 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. 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. https://www.amazon.com/Explore-Scientific-68%C2%B0-40mm-Eyepiece/dp/B007LMG3F6/ref=sr_1_1?dchild=1&keywords=explore+scientific+68&qid=1606584676&sr=8-1, Thanks for your reply, I think I will go for the Orion Q70 . I often recommend a 32 mm Plossl as a good low power wide view eyepiece for scopes with a 1.25 focuser. Sony A7III vs A7RIII Astrophotography: Which One to Shoot Infinity! SV207 30mm Super Plossl Eyepiece. SVBONY Direct . It costs three to four times as much as the Celestron Zoom, but if you have the budget, this is the one to get. 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. 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. Some brands will add better lens coating, darker edges, or a higher quality case to their Super Plossl products, but strictly for performance, there isnt a difference between the two.
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