I am considering buying another eyepiece, maybe 6mm, and a Barlow, maybe 2x, to give me a wider and higher range of magnification. Note that we also gained a 16 mm magnification at no additional cost. The design uses a planoconvex, two cemented-element eye lens and a large convex field lens. You can find the eyepieces I use and recommend in this article. In comparison, Aspherical lenses generally have no color distortion but might not work out well if the telescope user needs really high magnification. 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. One of the main drawbacks of this eyepiece, though, is the eye relief. What Is A Barlow Lens For A Telescope? But I have one little niggle. FOR SALE! Also, children do not often have highly developed motor skillsso I would avoid the frustration of switching out eyepieces, and consider a zoom lens. 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. 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. Good 32mm Plssls run around $30-$40. Plossl eyepieces are great. I really enjoy usingPlssls. 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. 1. Quality this good usually costs a lot more. But what are the other differences? With a 8" dobsonian, a 6mm is very versatile. The telescope comes with a 2x Barlow so I was thinking of getting one of the zooms you recommended. Does this sound like something you would recommend based on the telescope I have? For astronomical observations, such as viewing craters on the moons surface from Earth, high-magnification models are preferred because they offer more detail. Plossl eyepieces have wider fields of view than Kellners. 1.25" Power mates with T ring adapter. Though not the Meade. Again, this is more noticeable in lower focal ratio scopes. To get the best performance, you have to be willing to pay the price. 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. All are good eyepieces and diagonals, and would be excellent for star party use. You can accomplish a longer eye relief by barlowing a longer f/l plossl, so that is something to think about as well. thanks Ed. I do not miss beating my eyelashes against a 9.7mm Meade Plossl that I used to own. If you are on a strict budget, this is a good choice as a zoom eyepiece. This gives us more flexibility at the low end of the magnification range. The larger barrel allows them to create an eyepiece with a higher AFOV. I recently purchased the SVBony 7-21 zoom from Amazon. If you do choose to go with a Plossl eyepiece, I highly recommend spending some extra cash to get yourself a decent good quality branded Plossl eyepiece rather than going for a cheap, generic eyepiece which is a Plossl only for the namesake. While eyepieces with relatively complex, proprietary, or bespoke designs are becoming more commonly available in the beginner price bracket, there is often good reason to choose a much simpler design. How important a consideration is this when deciding on an eyepiece? However, the BH Zoom is by far my most used eyepiece. If we look at the range I provided above, we see that we could replace several eyepieces with one zoom. Lets look at the minimum. Note that as we get into the higher magnifications, the millimeter jumps between eyepiece focal lengths gets smaller. 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 . Plus the FOV expands as you zoom to the higher powers. My other eyepieces, ES and Meade 82 degree, stayed in the eyepiece case most of the time. These are exceptional eyepieces, and only available on the used market nowadays. I continue to be very pleased with the ES82 eyepieces. And remember, when all else fails, read the instructions. Youll find yourself adjusting these type of factors less than. About Us | Privacy Policy | ContactLittle Astronomy 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. https://telescopicwatch.com/celestron-starsense-explorer-dx-102-130-reviewed/, If I was to upgrade these lenses, I was planning on working toward something like this: I can recommend these with confidence. 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. Aspheric eyepiece is a variation of Plossl design, it has an anti-reflection coating on the front glass surface to ensure maximum light transmission and will also provide your instrument with better quality images if you need higher magnification levels. 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. You can do that by using this long focal length eyepiece. Then set your maximum based on your aperture and split it up. 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. If you plan to go longer than that you can get an AC adapter or a power tank. Know what diameter eyepieces your scope takes. still, i somehow managed to avoid the eyepiece pitfalls when buying used off ebay. Do you think the Baader Hyperion Zoom would work OK with the Skywatcher 150p? . 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. 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. a breath of fresh air! Thanks so much. Its quite long but that is what we are aiming for and hopefully, it was useful to you. 2x Barlow This design has some advantages over other designs, such as the Kellner eyepiece or Orthoscopic eyepieces. 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. So if you need to go to Arcturus and then go 2 degrees to the right to find your target, you can use the FOV of the eyepiece to estimate 2 degrees. 1:10 . As we go up in price range, we gain capabilities that may not be immediately obvious. Some optics brands have taken the next step and launched some eyepieces they have labeled as Super Plossl. Worth it is a tough question to answer. Are plossl eyepieces still worth it? They are all 4-element Plossl eyepieces, and most have a 52-degree field of view that is common to the Plossl design. I had a bino pair of TV 20mm Plossls, very fine for high power planetary observation with my long focus 8" Mak, then I also bought the older TV 21mm Plossl, after trying the 21mm I sold the more recent 20mm. At shorter focal lengths they have less eye relief, and at all focal lengths they have a narrower field of view, than newer types. Elena is a Canadian journalist and researcher. So save yourself this future unnecessary expense and just buy a Plossl. 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. It is all about your budget, your goals, and your objectives, as outlined in the article. It also was considerably more expensive. For it's cost, a 32mm Plssl eyepiece is hard to beat. A Barlow lens is an optical device that goes between the eyepiece and the focuser. I would like to know what is best for a 7 year old that would be getting his first telescope. Eyepiece Field of View Simulator astronomy.tools Field of View Simulator Change Telescope Reset Change Target Add Equipment Plossl eyepieces are perfect for astronomical viewing because the field of view is wider. The views through it are very impressive, and it always amazes me when I get that one out. The Wiki article(s) were very good if anyone else is confused. Even if the scope comes with the more acceptable Kelner or . Hi Ed, > Click here to jump to the Best Eyepieces section. 5-Minute Read, How To Increase The Magnification Of A Telescope; 5-Minute Read. I have seen wider-field Plossls. Plossl eyepieces have 4 lenses that are paired in two doublets. We have a range of 32 mm to 3 mm. This makes them a bit more complex and expensive than other designs, but also gives them a wider field of view, reasonable eye relief, and reduces optic aberrations. To achieve a maximum of 200X (2X the aperture of 100 mm), we solve for the focal length. Plossls are the clear winner here in most cases, unless you have one of the wider-field 50-degree Kellners. This is why many telescopes come standard with at least one Plossl eyepiece. The field of view of a p Plossl eyepiece is typically 60 to 120 degrees. Disclosure - If you buy something via our link, we may earn a commission with no additional expense to you. very happy. The TFOV will be as wide as your 40mm Plssl, but with greater magnification and a slightly darker sky background. In the case of the Celestron, you get all the focal lengths from 24 to 8mm in one eyepiece that costs $100. They all work, but as you go up in price, you gain features or performance or both. Do you think it would be sensible for me to look at getting a higher magnification specific eyepiece? As for Barlow Lenses, take a look at this article. Finally, a wider field of view just makes it easier to find stuff. The 4000 SWA's were way overpriced for their performance IMHO. Once we are done, they will make sense. Despite this, I also have some Plossls which are indispensable. This eyepiece was even better at correcting false color fringing, but because of internal reflections, the glare was even worse. So we say that an F5 scope benefits from better corrected eyepieces more than the F10 scope. Understanding and using a Barlow Lens There is a little bit more to it than that and there are other design . But those EPs mentioned were all great too! The 66-degree AFOV of the Gold Line series provides a 32% wider field than Plossl eyepieces. 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. When I was getting my start in the hobby, I bought an ultra-cheap ($15?) Unless you are a professional astronomer or extremely demanding, you can select your eyepieces based on magnification, the apparent field of view, eye relief, and price. Suggesting an F6 scope becomes an F18 would also imply things like reduced CA in a refractor. 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. A Kellner eyepiece has 1 double lens and 1 single lens. 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. They are just OK, but I dont recommend them, especially in a low focal ratio scope. A good modern eyepiece like a BST starguider 12,8 and 5mm are excellent eyepieces. In the beginning, you are not going to know what the atmospheric conditions might be in your area. Yes, Plossl eyepieces are some of the most popular with amateurs and professionals alike. A wide range of focal lengths are available, all in 1.25-inch size. This Super Plossl design was better than regular Plossl eyepieces, but not by much. Note that the Explore Scientific 68 and 82 degree eyepieces are also available in 2 size for your low power wide view requirements. It uses two symmetrical pairs of glass elements (one convex and one concave) to pass the light. 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. I need some eyepieces with long FL for low magnifications. Kellner eyepieces work perfectly with small and medium-sized telescopes. Ive read reviews about my scope. However, sometimes i am at the end of the range of the binocular focus adjustment. 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 . Celestron Omni Eyepieces: The Omni series is the most economical eyepiece offering from Celestron. I currently own a Mak127 ( that can't use 2"eyepieces) and a 80ED ( that one can hold 2"eyepieces). 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. But the conventional way of expressing it is in terms of eyepiece focal lengths. Of course, the entire eyepiece must be manufactured and finished correctly to realize the design's full potential. I often recommend it. SVBONY Telescope Eyepiece Set Telescope Accessory Kit with 2x Barlow Lens 4 Element Plossl Design 6.3mm 32mm 40mm for Astronomical Telescopes. Most people prefer the wider TFOV. Outstanding job Jack. Be aware of the focal ratio of your scope. Excellent, thank you for the breakdown, very much appreciated. Have Any Astronauts Been Lost in Space Forever. 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. This is your Lexus, Acura, and Infinity types that offer more features, better build, and a bit more polish. Remember that visual and AP have very different requirements, so plan on at least two different optical tubes. You can build a full set of these with good results, but be aware of eye relief, especially if you wear glasses. Question: would it perform well with 1.5/2x and 3x Barlows? If your scope uses eyepieces that are closer to 1, then you have an old style .965 that is now obsolete. Choosing the most appropriate can completely change your experience in using telescopes. Scott. If you want to buy him $200 eyepieces so he can grow into them, that works. This is my all-time favorite eyepiece and the one I use more than all the others put together. When a beginner is choosing eyepieces on a budget, there are a number of possible designs they may choose between. I had a newer - purchased in 2016 Meade 32mm (white lettering) that was no better than the older 32mm 4000. That's hard to beat IMO. Most likely it will be used as a loaner eyepiece to go with one of my two loaner telescopes. Meanwhile, Plossl eyepieces are much more common and easy to find. 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. Field of view, is about finding, framing, drift time, and context. The Plossl eyepiece is a type of optical system that was invented by Ernst Abbe. What focal length eyepieces should I buy? The sharp/crisp view you get from your 40mm Plossl comes down to the relatively low magnification it provides. These eyepieces have about 35 to 50 degrees apparent fields of view and reasonable eye relief, though quite short for high magnifications. Orion Sirius Plossl 1.25" eyepieces are ideal for all types of telescopes: reflector, refractor, and catadioptrics such as Maksutov-Cassegrains. Now we just divide it up and fill in some sample focal lengths. These lenses are connected together. PayPal, cash, bank transfer are all acceptable. This type of eyepiece provides you with wide-field views without any distortion due to its use as an achromatic lens system which reduces chromatic aberrations by combining two lenses made from different types of glass materials together on each surface. So, I think it worth your while to try the Plssls. Or take one of your eyepieces and measure across the bottom of the barrel. A 2 barrel on the eyepiece will allow the manufacturer to create an eyepiece that provides a wider field of view. A Barlow lens can save you money and add flexibility. 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. Combining a cheap eyepiece with a cheap barlow isn't a elegant solution. The bottom line is that it is best to have several magnification choices so you can optimize the view. But your point is well taken. The only reason it's in this list because of its price and a long focal point. Required fields are marked *. This will become more apparent the wider the AFOV is of the eyepiece, in my experience. When you use a Barlow lens with an eyepiece, you get the magnification, but the eye relief is not affected. Well-made lenses are expensive though, so in general the more lenses, the higher the price of the eyepiece. is pretty forgiving of eyepiece faults and a wide variety of eyepiece designs will work just fine in it. Save my name, email, and website in this browser for the next time I comment. . Divide that by the magnification of that eyepiece in that scope. It offers good color correction and high-contrast images. It also gives the widest possible exit pupil in my dob and SCT, very handy when using nebula filters. On many occasions, that will be too high power for the atmospheric conditions. Such eyepieces are able to offer great performance, i.e., satisfactory degrees of deviations, to about a 50.degree field. This eye piece provides the maximum true field of view in the 1.25 inch format. These come in focal lengths from 2.3 mm to 25 mm. Pay attention to the eye relief, especially if you will be observing with glasses. The focal length range for 1.25 Plossls is about 6mm to 45mm. How will my telescopes focal ratio affect my purchases? These are the best in optical performance and build quality. I have Celestron and the Baader Hyperion. This is just a planning target. Plossls tend to come with large, ground-standing Dobsonians, whereas youre more likely to find a Kellner sold with a tabletop Dobsonian. The Baader offers wider fov, but at quite the price premium. https://telescopicwatch.com/best-telescope-eyepieces/. Plssl eyepieces are affordable and they're outstanding additions to amateur telescopes.
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