The big problem with Plssls is that the eye relief is about 0.75 times the focal length. It uses two symmetrical pairs of glass elements (one convex and one concave) to pass the light. 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. It also produces an erect image, meaning you see what youre viewing rather than seeing everything upside down or sideways as some types do. They deliver sharp images in almost all telescopes. The Regular Plossl eyepiece is made to be a basic type of scope for viewing objects that are nearbysay within two feet or so from where youre looking through it. These sizes have become the industrys standard sizes. Ive added comments on where you may find and use them. They also improve a bit when it comes to eye relief. 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. I found an ES 70 degree AFOV 35mm eyepiece and am wondering whether I should get this or the Orion 38 70. Worth is a subjective evaluation, so here is my subjective input: 1. That is a really interesting picture. We are a reader-supported organization. If you stumble the first few uses, dont be discouraged. When you add eyepieces to your collection, you will want to consider what field of view you want and how much you are willing to pay for it. Hi Ed, But for AP you should really start your planning with the mount. The reason a plano-convex lens is good for using with a telescope is that it provides for both magnifying and erecting the images. The field of view of a p Plossl eyepiece is typically 60 to 120 degrees. eyepiece shows signs of use with caps and bolt case, 32 mm Plossl very good cond. The Plossl eyepiece is a type of optical system that was invented by Ernst Abbe. In retrospect, I should have included Tele Vue. Lets take a look. I had a TV 20mm Plossl once. I have personally tested a few Super Plossl and compared them to their regular counterparts by the same brand. I continue to be very pleased with the ES82 eyepieces. Etc.? You will get varying opinions on this but I would not worry too much about this. The 66-degree AFOV of the Gold Line series provides a 32% wider field than Plossl eyepieces. Plossl eyepieces have a wide FOV and are known for their clarity and sharpness. As a result, this can cause aberrations in the image as you move from the center of the view toward the edges. Then set your maximum based on your aperture and split it up. Since it's such a popular eyepiece and allows for quality, planet-viewing, that makes it a great instrument for attracting newcomers to the hobby, especially children. Choosing the most appropriate can completely change your experience in using telescopes. 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. Read our full affiliate disclosure here. This eyepiece was even better at correcting false color fringing, but because of internal reflections, the glare was even worse. With regards to budget, whatever works well and is on par with the quality & capability of the telescope. 2x Barlow 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. You can add the specialty single FL eyepieces later if you wish. You might be able to find a Kellner, or perhaps a high-quality Orthoscopic. Take the AFOV of the eyepiece (provided by the mfg) in your case 82 degrees Since there are so many different types of eyepieces available on the market, choosing the right one for your situation can prove to be a harrowing task. A zoom eyepiece works like the zoom lens on a camera. There are certainly much better options out there but at a significant cost. 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. 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. Plossls and Kellners, like other simple eyepiece designs, have moderate fields of view and tend to have short eye relief as you scale them down to shorter focal lengths. Quality this good usually costs a lot more. By default, expect a 40-degree field of view in a Kellner and a 50-52 degree field of view in a Plossl. Scott. Besides fov, How would you compare the optical quality of the Celestron to the Baader? the reality is that today's eyepieces are all quite good, particulalarly in an f/10 telescope. All registered. With an f/10 telescope, Plossls are as sharp as any other kind of eyepiece of the same focal length. So perhaps you do your line up like this. Jupiter and Saturn are low in the sky now. Disclosure: This post contains affiliate links and I may earn a small commission (at no extra cost to you) if you click through and make a purchase. These will normally be higher priced and may be outside the price range we show here. So you would have to test the set to see the actual result. . Save my name, email, and website in this browser for the next time I comment. 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). 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. 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. I want to help you select the best eyepieces for your budget and your telescope. How Good Are Super Plossl Eyepieces for Astronomy? Also, note that the pricing is based on 1.25 eyepieces. 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. You can accomplish a longer eye relief by barlowing a longer f/l plossl, so that is something to think about as well. For that purpose it is probably easier to find one to borrow. 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. I cannot thank you enough! Its quite long but that is what we are aiming for and hopefully, it was useful to you. Their 50 to 52 degree AFOV is wide enough for general observing. If you have a longer focal length telescope, your shortest focal length eyepiece will be a higher number than what I have shown here. 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. AP is all about the mount and accurate tracking. This is your Lexus, Acura, and Infinity types that offer more features, better build, and a bit more polish. It's one of the best choices you have when it comes to budget stargazing. short answer: yes. The zoom can be used with any 1.25 focuser too. Thanks. Then there is a pair of 32mm and 20mm TV Plossls which make my binoviewers work well with a Daystar Quark H-alpha solar filter. A Televue Plssl may be better than a generic one, but the difference is probably not worth the additional cost. Im fairly picky so would extend budget for better eyepieces if its worth it. Again, I only do this for my low power wide views. This is important to keep in mind because it means brands have to try really hard to one-up each other because the competition in a niche hobby such as astronomy can be fierce. I am considering buying another eyepiece, maybe 6mm, and a Barlow, maybe 2x, to give me a wider and higher range of magnification. Perhaps another review would be helpful. By having a range of magnifications, you can optimize the image, which means you need more eyepieces. I still have it and still use it from time to time. The sharp/crisp view you get from your 40mm Plossl comes down to the relatively low magnification it provides. Omni 6mm Eyepiece - 1.25" Learn More. However, there can be a problem bringing the eyepiece into focus. 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. I would like to know what is best for a 7 year old that would be getting his first telescope. https://telescopicwatch.com/celestron-8-24mm-zoom-eyepiece-review/. Dont worry about the math, as its simple stuff you can do with any calculator, on paper, or perhaps in your head. that I could slide into my telescope and look at. Perhaps you should seek out help from your local astronomy club. Fully coated with magnesium fluoride on every air-to-glass surface for excellent light transmission and high contrast views. I do not miss beating my eyelashes against a 9.7mm Meade Plossl that I used to own. I have the 38 mm and recommend it often. A wide range of focal lengths are available, all in 1.25-inch size. Plossl eyepieces have wider fields of view than Kellners. This is where the cheap eyepiece will frequently fail to deliver a good image, around the edges. Hi Ed, NEW. 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. The Big Bang Optics also participates in affiliate programs with Clickbank and other sites. 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. These are matters of individual preference and budget. I still use my 30mm Celestron Ultima fairly often with some of my telescopes. I guess my curiosity is mostly about the diagonal. I am not aware of an ES branded 70 degree series in the USA, but they do have a Bresser branded 70-degree series. It costs a lot to get that last 10% of performance. Save my name, email, and website in this browser for the next time I comment. https://telescopicwatch.com/best-barlow-lens-and-how-to/, Celestron 8-24 Zoom Review They are usable, but your eye will be extremely close to the top lens glass. For visual use, 1.5X, 2X, 2.5X, and 3X Barlow lenses are common. As we go up in price range, we gain capabilities that may not be immediately obvious. Customer reviews Average Rating (16 Reviews): Write a Review and share your opinions! Omni 56mm Eyepiece - 2" Learn More. Do you need to have the best to enjoy astronomy? My love affair with space began in a field in India at the age of 7, when I looked up at the Milky Way for the first time. 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. Some reviews also suggest replacing the diagonal. 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. 32mm (20x & 40x). Do you have any additional comments to help me? ORION SIRIUS PLOSSL 10mm telescope eyepiece 1.25" - $17.01. 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 focal length range for 1.25 Plossls is about 6mm to 45mm. At shorter focal lengths they have less eye relief, and at all focal lengths they have a narrower field of view, than newer types. That can only be shown through actual testing. Am I correct? You alluded to them, but you never mentioned Tele Vue. What should one opt for a 2 EP over a 1.25? 6.5-ish mm (100x & 200x) Generally, Plssl eyepieces are best suited to Newtonian and fast telescopes. This eye piece provides the maximum true field of view in the 1.25 inch format. Not really. Now we just divide it up and fill in some sample focal lengths. 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. Glad you found it helpful. One learns by observing. When I had a 6mm Kellner, I found the eye relief annoyingly short, sure, but when compared to the 6mm Plossl that often comes with eyepiece kits, it was luxurious. There are so many others at comparable or higher prices, many of which are quite good and some rather poor. I would expect it to be similar to the Celestron in image quality. There are inexpensive adapters that will let you use standard 1.25 eyepieces in a .965 focuser/diagonal. We have compared Plossl against Kellner eyepieces in a previous article. If that is the case, it will give me another reasonably good, inexpensive zoom to recommend to beginners. 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. I've got a one-off plossl like that in my kit that I'll probably never sell, (aside from my 5 element ones) and it's one that is rarely seen. 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. 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. These will eventually be used in an 8in dob whenever it arrives. The third choice of eyepieces is the Orion 12 mm Sirius Super Wide Angle Correct Image Eyepiece. We can see that 2 eyepieces have an advantage over 1.25 eyepieces when designers are making wide-view eyepieces. That said, I should also tell you that not all Plossls are created equal. The bottom line is that it is best to have several magnification choices so you can optimize the view. but the meat of the article is about understanding the considerations and specifications to know when selecting eyepieces. High-quality Plssl eyepieces provide high contrast and sharpness across the entire field of view. Plossl eyepiece is good for astronomy and microscopy. 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. 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. . Ah I see what you are saying, I had wondered whether this might have had an impact as Ive seen it mentioned before but dont fully understand it so will do some research, thank you . In some cases, the eyepieces are waterproof to protect them from internal contamination caused by heavy dew conditions. https://telescopicwatch.com/orion-skyquest-xt8-intelliscope-review/. I had one and sold it. You will see these under many brands, including Orion, Celestron, GSO, and others. Warranty Limited Warranty against defects in materials or workmanship for one year from date of purchase. Pentax K-70 Astrophotography: The Ultimate Camera on a Budget! And the zoom provides every magnification in that range without having to change eyepieces. Very nice article. They are also good for those who have astigmatism because they are designed to be more forgiving with eye placement. On the inside, they are exactly the same design. Also, as the apparent field of view gets wider, the image will require more correction. I generally use my 40 to search for DSOs so Ill probably replace that one at some point too. A typical zoom eyepiece has a focal length range of 8 mm to 24 mm. Disclosure - If you buy something via our link, we may earn a commission with no additional expense to you. Generally, dont mess around with solar projection unless youre okay with damaging the instrument. Not perfect to the edge but better than the Bresser, in my opinion. To say it a different way, in general, an F5 scope will place more demands on the eyepiece around the edge of the field of view than an F10 scope. If one Super Plossl specifies it uses a 5 lens design, then you can definitely consider it a true Super Plossl that might offer better performance, but no brand has released any of those for decades. These eyepiecesproduce a 'standard apparent feld of view' of between 50 and 56 with most set at around 52. Theres a reason Plossls are usually kept at 52 degrees. 8.5-ish mm (75x & 150x) You can enjoy wide-angle views without giving up any of the clarity or sharpness when using Plossl eyepiece while Kellner will give you more magnified views but at less than half the brightness levels in comparison to other lens designs on this list if light pollution was involved. These are effectively simple designs like Plossls, Kellners, Konigs, and RKEs, with long focal lengths, that have a lens included to increase their focal length. Achromatic vs Apochromatic refracting telescopes. I have an SCT and my eyepiece case only hasPlssls (and one Ortho) in it. A standard Plossl eyepiece is typically between 20mm to 25mm but can range anywhere from 15mm up to about 40mm in diameter. 11 = 163 = .5 Celestron 2026 Erecting Prism Barlow Lens Set is another great choice for those looking to get a variety of magnifications. No price limit? Newer multi-coatings are better, I suppose, but newer does not always mean better in the ocular game. A Barlow lens is an optical device that goes between the eyepiece and the focuser. However, your budget must guide your purchases. These are exceptional eyepieces, and only available on the used market nowadays. If you don't like the reflections, there really aren't many other budget options at its focal length beside a Plossl which will be super uncomfortable to use, or spending over $100 for something like a Meade UWA. 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. Omni 9mm Eyepiece - 1.25" Learn More. You noted eye relief is important for those wearing glasses. i still use the binos. These come in focal lengths from 2.3 mm to 25 mm. https://telescopicwatch.com/best-astrophotography-telescopes/. Be aware of the focal ratio of your scope. Through the 32mm eyepiece, objects will look larger, and though they may have a lower surface brightness, the surface brightness of the background sky will also be lower. Also work very well with my binoculars that have removable focal reducers built into.
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