are plossl eyepieces good

Or, you may find that you like the 8 mm and 6 mm used with the Barlow and can avoid the expense of two eyepieces. I expect such eyepieces are available but I have never seen or used one. Lets illustrate with an example using a 1200 mm FL telescope. 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. Higher priced eyepieces usually include more elements in the optical path that are there to help reduce or eliminate aberrations that can be seen around the edges of lower cost eyepieces. still, i somehow managed to avoid the eyepiece pitfalls when buying used off ebay. This was my first zoom eyepiece and the one that caused me to fall in love with zoom. Telescopes Cost: Acceptable, Good, and Really Good Telescopes, Used Telescopes Buying Guide The Complete Guide, Different Types of Asteroids (C, S, and M) The Definitive Guide, Top 10 Night Sky Objects for Astronomy Beginners, Asteroid Mining Know Everything About It, German Equatorial Mounts (GEMs) Overview and Working. 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. 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! You are asking about a very specific eyepiece in a very specific scope combined sometimes with a Barlow. eyepiece shows signs of use with caps and bolt case, 32 mm Plossl very good cond. The Big Bang Optics also participates in affiliate programs with Clickbank and other sites. Do I need an adapter if my scope has a Plossl lens? And remember, when all else fails, read the instructions. 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. Plssl eyepieces are good all-around performers, producing sharp images at the center of the field, but they have only four lens elements. 8.8 = 240 = .34 A Plssl is probably as good as any 32mm eyepiece in a 1.25 inch focuser. But in this scope, the 32 mm doesnt work well. 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. They offer a 52-degree apparent field with clean, high-contrast images. My own lineup (with a C8) is 32mm Plossl, 18.2mm DeLite, and 10.5mm Pentax (the last one not chosen to match, but rather because it belonged to a deceased friend). Thanks all. Now, for my one or two low power eyepieces, I also like to know the field of view provided by that eyepiece. I wont go into all the types of aberrations that can be there. 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. Their 50 to 52 degree AFOV is wide enough for general observing. 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. https://www.widescreen-centre.co.uk/explore-scientific-70-eyepieces.html. I cant answer that specifically as I have no experience with that eyepiece in that scope. They also improve a bit when it comes to eye relief. It comes with 1.25 Plossls 25mm (26x) and 10mm (66x) eyepieces. My other eyepieces, ES and Meade 82 degree, stayed in the eyepiece case most of the time. Again, for no other reason than to compare it to the 17mm Hyperion and draw your own conclusions about Plssls. 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. If you wish to find a short-focal length eyepiece with a longer, more comfortable eye relief, you could use a long-focus eyepiece with a separate, high-quality barlow lens (an achromatic or apochromatic fully multi-coated barlow would be necessary), or you could purchase one of the several designs incorporating a smyth/barlow lens into the eyepiece design. Was $38.99 - $99.99 Now $31.19 - $84.99 Compare Orion Edge-On Planetary 1.25" Eyepieces In that respect, they are similar to the Explore Scientific 82 degree mentioned earlier. 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. Between $100 and $250, I will call it mid-range. However, the BH Zoom is by far my most used eyepiece. no caps come in bolt case. I would wait till you get the scope and use the included eyepieces. They include links to them where they can be ordered. Since each eye has a different focal point, I suspect pulling the eyepiece out until reaching focus and then tightening the set screw. Plossl eyepieces are perfect for astronomical viewing because the field of view is wider. These are matters of individual preference and budget. They have decent eye relief and little curvature of field. How do you focus - I would have expected helical focusers in the eyepiece holders but don't see any? But for AP you should really start your planning with the mount. In addition, the eyepiece would be a Huygens or Ramsden design, where two lenses made of the same type of glass could be combined to yield minimal false color fringing, as long as the focal length of the telescope remained fairly long. Choose three focal lengths. Us big kids like zooms too. Tip Its almost always cheaper to buy directly from Agena Astro. 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. For our experience level, would you recommend changing anything right now? How Good Are Super Plossl Eyepieces for Astronomy? Oh the pain of uh having access to really cool eyepieces.). We often end up spending more on eyepieces than we did on the telescope. You will see these under many brands, including Orion, Celestron, GSO, and others. Note that the price categories are approximate, as prices can vary between retailers. Many Kellners are made with field stops opened up to 50 degrees, in which case it can truly compare to a Plossl in any telescope with a focal ratio of f/6 or slower. If you are on a strict budget, this is a good choice as a zoom eyepiece. Many thanks. The computerized pad and motor work on AA batteries which can last you a few hours. In comparison, Aspherical lenses generally have no color distortion but might not work out well if the telescope user needs really high magnification. As is outstanding in the workmanship, a Plossl type eyepiece is a moderately wide field eyepiece involving two colorless doublets in which the crown components generally face each other. Plossl and Kellner eyepieces are two very common examples of a simple eyepiece design, and they are probably the most common type of eyepiece you are likely to come across when eyepieces have been bundled with a telescope; they are also a very common aftermarket accessory. In this case, I am going to define this by the focuser and eyepiece size. They have a 50-56 degrees field of view, better eye relief, and cost more than Kellners. I am going to use 6. The bottom line is that it is best to have several magnification choices so you can optimize the view. Plossl eyepieces are often included in better telescope packages as the starter eyepieces. Plossl eyepieces are great. The TFOV of the Hyperion will be greater than the TFOV of the Plssl, but the magnification will be about the same. How important a consideration is this when deciding on an eyepiece? Edited April 23, 2010 by russ teh_orph Members 28 198 Author So your 600 mm example (f/6) becomes, in effect, an 1800 mm focal length, f/18 but it does not change the focal length of the eyepiece. Compared with a zoomable telescope eyepiece, they are pretty much the same in terms of the quality of the image. Even big telescopes are subject to limitations imposed by the atmosphere. Here are a few types of eyepieces you may read about and their typical AFOV. Using this 40 mm Plossl eyepiece is an excellent way to get a wide field of view with your telescope. Eyepieces are a religion. When discussing eyepieces, you will hear people comment on how well the eyepiece is corrected. Explore Scientific 68 34 mm or ES 82 30 mm would also be good choices at a significantly higher price but with better edge correction. This series of eyepieces may provide better value in this price range. I often recommend a 32 mm Plossl as a good low power wide view eyepiece for scopes with a 1.25 focuser. Once we are done, they will make sense. Are Plossl eyepieces good? They also offer a generous 16 mm of eye relief which is most important in the shorter focal lengths. Have Any Astronauts Been Lost in Space Forever. Youll find yourself adjusting these type of factors less than. 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. Plossl eyepiece is one of the reasonable options when it comes to telescope eyepieces for stargazing or astronomy. 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. Save my name, email, and website in this browser for the next time I comment. If we look at the range I provided above, we see that we could replace several eyepieces with one zoom. They also have good eye relief, making them comfortable to use for extended periods. Any 1.25 eyepiece will work with the BH Zoom 2 adapter. Plossl eyepiece is good for astronomy and microscopy. 30 = 60 = 1.3 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 found an ES 70 degree AFOV 35mm eyepiece and am wondering whether I should get this or the Orion 38 70. 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. 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. They are not that expensive I would pay about $100 for both eye pieces. If that surface is wobbly the scope will be almost useless. What follows are specific eyepieces that I have tried, own, or have read so many good reports about that I feel very comfortable recommending them. In my opinion, there are no wrong exit pupils. 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. If your focuser/diagonal only accepts 1.25 eyepieces, I would recommend you use a 32mm as your longest focal length, lowest power eyepiece. Do you think the Baader Hyperion Zoom would work OK with the Skywatcher 150p? So plan this into such a purchase. We can see that 2 eyepieces have an advantage over 1.25 eyepieces when designers are making wide-view 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. 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. A wide range of focal lengths are available, all in 1.25-inch size. Whether it is cars or telescope eyepieces, there are inexpensive ones, upgraded models, and very expensive ones. It includes two high-magnification Plossl eyepieces and five lower magnification zoom oculars with an adjustable focus in the kit. I also really liked my E-Lux 32mm, a Kellner. All focal lengths offer 50 field-of-view except the 40mm which offers 42 But the difference in price to get to the next level is high, and the performance difference may be small. Simple Plosels work well and unless you have money burning a hole in your pocket, I would start with simple affordable eyepieces. Lets look at the minimum. Kellner eyepieces use three glass elements in two groups to minimize color fringing. Are Plossl eyepieces any good? Fortunately, the investment can be leveraged with future scopes since eyepieces are standard sizes so they work in almost any telescope. Plossl eyepieces have 4 lenses that are paired in two doublets. Like going from a 32 TV to a 65? Press Esc to cancel. 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. 1:10 . Plossl eyepieces have a wider field of view that can go from 50 to 56 degrees. The combination of high-quality optics and accessible prices have made them the favorite design for amateur astronomers and even professionals. For example, if you put a 30 mm eyepiece in a 3X Barlow, it will triple the magnification you get from that eyepiece. This gives us more flexibility at the low end of the magnification range. i dont have 1 of everything, and i bought the best i could afford on a low budget; meade and orion. As a result, this can cause aberrations in the image as you move from the center of the view toward the edges. 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. A 6mm Plossl has a tiny eye lens. Can you suggest the total . This design has some advantages over other designs, such as the Kellner eyepiece or Orthoscopic eyepieces. 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. At 32mm, a Plssl will give you as wide a field of view as any 1.25mm eyepiece can. To determine a magnification range, we will start with the aperture of the telescope, the size of the front lens, or the mirror in the back. https://telescopicwatch.com/best-telescope-mounts-for-astrophotography/, https://telescopicwatch.com/best-astrophotography-telescopes/, https://telescopicwatch.com/best-barlow-lens-and-how-to/, https://telescopicwatch.com/celestron-8-24mm-zoom-eyepiece-review/, 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, https://telescopicwatch.com/orion-skyquest-xt8-intelliscope-review/, https://www.rothervalleyoptics.co.uk/baader-hyperion-mark-iv-8-24mm-universal-zoom-eyepiece.html, https://www.amazon.com/s?k=Orion+Q70&ref=nb_sb_noss_2, https://telescopicwatch.com/best-telescope-eyepieces/, 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, 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. In simple terms, high focal ratio scopes, say those over F6, tend to be less demanding on eyepieces than those below F6. the reality is that today's eyepieces are all quite good, particulalarly in an f/10 telescope. Or, you can have three properly sized eyepieces and use a Barlow lens to achieve three more magnifications, which is usually a less expensive way to go. I often recommend the use of a barlow to achieve the higher range of magnifications. Not everything in the sky benefits from high magnification. Free shipping for many products! 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. We have a range of 32 mm to 3 mm. A long eye relief is also important for those who wear eyeglasses at the eyepiece, whether thats a member of the general public at a star party or an astronomer with astigmatism, which, unlike near- or far-sightedness, cannot be corrected with the telescopes own focuser. The reason a plano-convex lens is good for using with a telescope is that it provides for both magnifying and erecting the images. 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 . All registered. Both will provide the same magnification. Despite this, I also have some Plossls which are indispensable. A Kellner eyepiece has 3 lenses, while a Plossl has 4. However, because they have more glass elements than other designs, like Kellners, their manufacturing becomes extremely important to get high-quality optics. With a 8" dobsonian, a 6mm is very versatile. The sharp/crisp view you get from your 40mm Plossl comes down to the relatively low magnification it provides. The 66-degree AFOV of the Gold Line series provides a 32% wider field than Plossl eyepieces. Of course, the entire eyepiece must be manufactured and finished correctly to realize the design's full potential. 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. 5-Minute Read, How To Increase The Magnification Of A Telescope; 5-Minute Read. However, some lateral color error is apparent when looking at bright subjects, such as Jupiter or Venus, against a dark sky. The atmosphere is typically the limiting factor as we get to higher magnifications. Is it just about finding and framing, or do wide fov EPs create a more immersive experience? Within the budget-friendly realm are the 6mm and 9mm Goldlines/Redlines (66-degree Ultra-Wide-Angle) for telescopes with a focal ratio of f/8 or longer, and the excellent 58-degree Planetary eyepieces, sold by a variety of sellers on Amazon and by Agena Astro, which come in a wide variety of focal lengths and are optically superb for their price. Today, most beginner telescopes of any quality are sold with either Kellner or Plossl eyepieces. These are things you will want to know and use. Using your example: We will use a 100 mm telescope with a 600 mm focal length and Another way to look at it is that a 30 mm eyepiece in a 3X Barlow works like a 10 mm eyepiece.. The views through it are very impressive, and it always amazes me when I get that one out. A rubber safety cap protects the lens when not in use while also providing additional grip on this 35 mm Plossl eyepiece. 3. . Comparing to Plossl eyepieces, Super Plossl is somewhat better for astronomy. This is the link to the one I plan to buy as I know some others come with add ons: https://www.rothervalleyoptics.co.uk/baader-hyperion-mark-iv-8-24mm-universal-zoom-eyepiece.html, Thats great you had an XT8i that makes me feel confident I got a good telescope . With your glasses on, you simply cant get your eye close enough to an eyepiece that only has 10 mm of eye relief. If there is a local club, I would suggest you visit and consider joining. Second? A Televue Plssl may be better than a generic one, but the difference is probably not worth the additional cost. Jupiter and Saturn are low in the sky now. For me personally, even though I don't use glasses to observe, I still don't want to dig out the view through a plossl or ortho eyepiece which tend to have short eye relief. Most telescopes come with one or two eyepieces, which gives you one or two magnification options. 6.5-ish mm (100x & 200x) It also gives the widest possible exit pupil in my dob and SCT, very handy when using nebula filters. 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. This may be enough for many eyeglass wearers. A four-element eyepiece was made by putting together two achromatic doublets with different focal lengths. (Focal ratio is a term that refers to the telescopes focal length divided by its aperture. These tend to run toward the more expensive price range. Its quite long but that is what we are aiming for and hopefully, it was useful to you. It had one of the best fields, edge to edge, in my SCT that I've ever seen. Then you can judge for yourself if it is worth it. Also work very well with my binoculars that have removable focal reducers built into. Im just starting out with astronomy and this really helped my understanding. It has made learning the Constellations and star-hopping more fun and engaging for my whole family exactly what I was hoping for. 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. After these, we have mostly proprietary designs from various eyepiece companies. Even if you did need a 4mm focal length (for high powers in an f/4 telescope, of course), neither a Kellner nor a Plossl would have long enough eye relief for that to be comfortably usable! In terms of eyepieces, my best advice is provided in the article. 4mm Eyepiece vs 20mm Eyepiece. Even if the scope comes with the more acceptable Kelner or . Come join the newest, most engaging and inclusive astronomy forum geared for beginners and advanced telescope users, astrophotography devotees, plus check out our "Astro" goods vendors. This number can range from 30 degrees to 120 degrees. I have owned wider eyepieces, but ultimately I just prefer the Plssls (must be a mental defect). Thanks for going through the entire post. Read our full affiliate disclosure here. The Plossl eyepiece is a four-element design consisting of two doublets. It was grueling, because I couldnt even get the entire field of viewI had to keep my eye hovering above the exit pupil. This is not a hard and fast rule, just a cautionary note. Good evening everybody. Tele Vue offers several series with apparent fields of view from 50 degrees to 120 degrees. Eyepiece Field of View Simulator astronomy.tools Field of View Simulator Change Telescope Reset Change Target Add Equipment It is pretty much worth it for everyone that has a telescope with a 1.25 inch focuser to have a 32mm Plssl. By correcting for aberrations, the field of view of these eyepieces could be much larger than the soda-straw field of view in a Ramsden or Huygens, around 40 or perhaps up to 50 degrees. At that price point, it couldnt compete with other 5-element devices like Erfle and Nagler eyepieces that had better performance. Your eyepieces do not need to be the same brand as your telescope. but the meat of the article is about understanding the considerations and specifications to know when selecting eyepieces. I had a newer - purchased in 2016 Meade 32mm (white lettering) that was no better than the older 32mm 4000. If you have a longer focal length telescope, your shortest focal length eyepiece will be a higher number than what I have shown here. It uses two symmetrical pairs of glass elements (one convex and one concave) to pass the light. Now looking for a couple of decent eyepieces. While I also have the Baader Hyperion Zoom, mentioned later, I continue to make use of the Celestron, especially in my smaller scopes. Not perfect to the edge but better than the Bresser, in my opinion. With regards to budget, whatever works well and is on par with the quality & capability of the telescope. 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. Finally, the worldwide pandemic has led to shortages and price jumps on many items. Be sure to read the following as you consider your eyepiece purchases. Thanks. A 15mm Plssl might be worth it, if you dont wear glasses. Below .5 mm exit pupil, floaters in the eye become more apparent and can be bothersome. Prices can run from $20 to $200 so the field is pretty broad. Hi - I bought these from another AM'er 1 year or so back, thinking I will get into visual astro, But never found the inclination, So here it is for sale 9mm Nagler type 6 mint with box and caps,16mm Nagler type 5,optics are exc. Ive added comments on where you may find and use them. These are considered to be the least expensive eyepieces for serious astronomy and are offered in focal lengths from about 6mm to 40mm. Note to spectacle wearers: Plossl eyepieces with 15mm and longer focal lengths are good choices for spectacle wearers but for shorter focal lengths the Celestron XCel LX series have greater eye-relief so are better suited. I still have it and still use it from time to time. I am a BIG fan of zoom eyepieces, especially if you dont have many. 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. Personally I think they're still worth it. How you divide up your magnification range is up to you. It should list what size eyepieces you can use. The original design for Plossl eyepieces has existed since 1860. Take a look at your manual or users guide. 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. Ive read reviews about my scope. Again, it only costs $30 to $40 to find out, so the education is not that expensive. As long as you take good care of them, Plossls can last you a lifetime, and you will be able to use them with your next telescope if you upgrade at some point. Do you need to have the best to enjoy astronomy? 70 mm scope will have a max of 140X for planning purposes. short answer: yes. These "other" ones I speak of, aren't technically that, they are a 5 element eyepiece, of a different design. You have a very wide choice of brands and styles to choose from. I have had a good experience with the SVBony brand and the Agena Astro brand. 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. 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. If you feel the need to buy something now, consider this Orion diagonal. I hear that, sometimes you find one that is sweeter than others. ORION SIRIUS PLOSSL 10mm telescope eyepiece 1.25" - $17.01. Gold Line eyepieces also offer better eye relief than Plossl eyepieces, especially at the shorter focal lengths. The view being presented to your eye in a low power eyepiece minimizes everything from optical aberrations in the telescope, to distortions from thermals or atmospheric conditions. You can build a full set of these with good results, but be aware of eye relief, especially if you wear glasses. The Japan made 16mm Meade 3000 was a very nice medium power plossl and the 40mm in that series was surprisingly nice as well. I also struggled to see features on both (gas bands on Jupiter and clear rings on saturn). I was looking on a OPT website and they have celestron 32mm and 15mm plossl. These are highly sought after ep's, and hold their value well. Buy Astromania 1.25" 4mm Plossl Telescope Eyepiece - 4-Element Plossl Design . Lets just say that once you get below F5, it is really hard for the eyepiece to deliver a clean image to the edge. There are certainly much better options out there but at a significant cost. Again, does it create a more immersive viewing experience? Aspheric and Plossl Plossl are both lens designs that can be used in most telescopes. Plossl telescope eyepieces are the most popular type of eyepiece on the market. Celestron Omni Eyepieces: The Omni series is the most economical eyepiece offering from Celestron. And new proprietary designs come out from time to time. Pentax K-70 Astrophotography: The Ultimate Camera on a Budget! Nice, thank you again for the additional inputs. 6mm Kellner eyepiece that I enjoyed a lot. As for tabletop scopes, dont forget that you need a table, stool, or bench to place them. To estimate the highest practical magnification for your telescope, you take the aperture in millimeters, mm, and multiply it by two. The longer FL Plossls (>15mm) have some distinct advantages over more complex designs without the major disadvantage of Plossls which is short ER. Do you think it would be sensible for me to look at getting a higher magnification specific eyepiece? However, there can be a problem bringing the eyepiece into focus. We will use a 100 mm telescope with a 600 mm focal length that only takes 1.25 eyepieces. . I see that there are some optical limits to how wide an FOV a 1.25 EP can manage at bigger (like 32mm) focal lengths. You can find the eyepieces I use and recommend in this article. The Expanse is a lens that provides an extra sharp image, and it also has a wider field of view compared to the Plossl eyepiece. Yes, eyepieces is a large and complex topic. If you are buying your first telescope, and you are choosing between the telescope that includes a Kellner or a telescope that comes with a Plossl, with all the other specs being similar, pick the telescope thats offering you the Plossl, even if its slightly more expensive. As new anti-reflection coatings were developed, it became possible to actually make use of complex lens arrangements (not just in relatively simple 4-element systems but also in convoluted, extreme wide-field eyepieces such as the TeleVue Nagler). In general terms, the higher the AFOV number, the more the eyepiece will cost. Question: would an 18mm Baader Classic Ortho mostly used for Moon and planets loose sharpness and contrast if used with a short F5 telescope like the Celestron Astro-Fi 130?

Santana Funeral Home, Articles A