Telescope Eyepiece, 1.25” Aspheric 4mm Eyepiece 62 Degree | for Observing Nebulae and Star Clusters, HD Fully Coated Telescope Accessory Eye Piece for Telescope

Really surprised at the overall quality of this very affordable eyepiece (EP)! Wide Apparent Field Of View (AFOV) of 62° and sharp across most of the field. Only thing that could be better is the Eye Relief (ER). To get the full AFOV, your eye needs to be pretty close to the lens. However, this being a high power EP at 4 mm, the ER for this level of magnification naturally won't be great for a "standard" EP like this one. Still, the nearness of my eye to the main lens is not that bad and again, very pleased with this product. What's especially nice is that there is a removable Barlow element threaded in the inside of the chrome EP barrel. That element can be unscrewed - which then makes this a 8 mm EP. So you essentially get 2 EP's in one! I also purchased the 23 mm and it's outstanding! The specs say that the ER on this one is "9 mm", but I'd say it's more like 12 mm-ish. That's not much more than 9 mm but it does make the viewing through it more comfortable. Love the big AFOV and very crisp images. Highly recommend both of these very good EP's as the next step up from any EP's you get bundled with a starter telescope and beyond!

The difference between this and my stock 25mm Kellner is night and day. Clear, crisp views made setting up my finderscope so much easier. And at this price I got a hell of a lot more than I expected. Seems to be built well and solid. I don’t know about more expensive eyepieces but I have to say this one is is worth every penny. Update: this has become my go to eyepiece. The wide angle makes tracking down object much easier. Yes there is aberration and halos around objects and no flip up eyecup. But it totally beats my stock 25mm. If you’re buying your first telescope I highly recommend this as a “starter” upgrade. For the price and night and day from your stock kellner this will do it. And you can buy replacement eyecups if you need

I used all three of these eyepieces (EP) in my 8” SCT f10; 4” MAK and fast 60mm f5 telescopes. Yes these are light, plastic and inexpensive but don’t let that stop you because these are a true value and I would highly recommend these to 99% of the amateur astronomers. I did a lot of research on the forum outside of Amazon, out there I saw mixed reviews, I agreed with some points especially on the 10mm. For my review I compared my expensive 8.8 and 5.5 Meade SWA EP’s to the 10mm and 4mm. For the 23mm I used my ES 24mm. I viewed on three different nights with good to poor seeing as well as daytime. The 23mm was excellent for day and night. Under dark skies I could hardly tell the difference between my expensive ES 24 and this eyepiece. The ES provided more contrast and darker backgrounds, but the brightness was very similar. Under a bright moon there was a lot of glare off axis, but the view was very good or better when on the objects. I viewed the Orion Nebula, Pleiades, Jupiter and our moon and the view was very good to excellent in all three scopes. The 24 ES cost more than 10 times this EP and so I would highly recommend this SVBONY EP to anyone, even the most critical observers. The 10mm was good to fair in daytime for terrestrial viewing. At night under dark skies the 10mm did not perform very well. The 10mm works ok for the moon but for deep sky the EP was not good. You could argue that comparing this to the Meade 8.8 is not a fair assessment, but I keep the same methodology for all three EPs. The 10mm was dimmer than my Meade 8.8 and did not provide good contrast on all objects in either my fast f5 or slow f10 telescope. Because the 8.8 provides more magnification you would expect the Meade to be the dimmer EP but the 10mm was dim and not sharp. The view in my 4 MAK and 8 SCT scopes was more poor than good. I would think that my slow scopes would be more forgiving, and this eyepiece performance would be better. The view in my fast 60mm was poor which would be expected. I have read similar experiences in the astronomy forums, so my n assessment is not a surprise. Having said all of this you really can’t beat this value of this EP and although I would not recommend the 10mm to everyone, it was certainly useable and probably an upgrade to the vendor supplied EP in less expensive scopes. The 4 mm performance was a surprise and was good for day and very good for night viewing. Under dark skies I could tell the difference between my expensive Meade 5.5 and this 4mm but unless you are using expensive EP’s most people would not notice a big difference. You will notice that the 4mm is taller than the 10mm and perhaps this design explains why the 4mm performs so well compared to the 10mm. What surprised me more was that the EP worked well in all three scopes, slow and even the fast 60mm f5 scope. Some reviews in the forums were very negative about the 4mm but I just could not see the problem. Perhaps it’s because 4mm is high magnification, the eye relief, tripods and mount steadiness, and your telescopes optics impact views at high magnification. My fast scope was inexpensive and has an unsteady tripod but my daytime bird watching and views of the moon and were very good. In the 4mm the views of the moon’s craters were sharp and well defined in the 4mm. Even when comparing to my Meade 5.5mm EP the views were comparable in the 4. Meade has a wider 82-degree view so it was easier to find items in the Meade. In some cases, the view was better in the 4mm than my 5.5 even though the 4mm provided more magnification. You would expect the 4mm to be dimmer than the 5.5 but it was not. I was surprised that the 4mm EP provided good views in my larger slow scopes. For deep sky objects the views were ok; its hard to tell at high magnification because higher power usually means dimmer views and its easier to see deep sky at lower powers. I did take a peek at Orion and the Pleiades and the view was ok. I was unable to test the 4mm on any planets but I would expect the views would be good. Overall, I can recommend this set of Eyepieces although I would probably not buy the 10mm again unless I needed it for a kids viewing session. The 23mm was surprisingly good, too good for the money. I would recommend the 23 to anyone and will probably by this again for my finder EP or binocular viewing. Certainly, if you don’t have a lot of money and need an upgrade buy the 23mm you will not be disappointed. The 4mm was surprisingly sharp and worked very well on the moon. Even with the 10mm performance issues this set of three is well worth the money.

I found a mediocre telescope at a second hand shop for 10$. It was a Celestron Power seeker 127. I know nothing about telescopes. Or know just enough to know I don't know. I didn't even realize the "big shiney fancy telescope" I found didn't have a lense🤦‍♀️, at least not till I bought it. Not wanting to spend a ton on a lense set to find something else was wrong, I did a little research and found something that suggested 4mm as an ok size for something like this. This lense was one of the cheapest and not horribly rated. I'm shocked at how clear my view was of the moon. For a foggy night, in the city. Wind blowing so hard it was wiggling the telescope. Overall a terrible night to try it but my 5 yr old is calling the shots and she could see the moon from a window inside so we had to test out the Christmas gift because according to her it was clear enough, I've added a photo of how "clear" it is tonight. This is what we saw with this little thing on such a horrible viewing night.

I'm very impressed. This was my first SVBONY purchase and I must say the quality is mind blowing for the price. The eye piece itself is comfortable against the eye. It is strong and sturdy and well made. The lense are clear and free of any imperfections which leads to amazing photos and videos with extreme amounts of detail. This is the first SVBONY of many I will be purchasing. I already have a few others in my cart.

I was shocked by how crisp the view I got from these eyepieces are when I first them in (one by one). I fully agree with previous comments that these eyepieces are decent and much much better than H20 (20mm) & SR4 (4mm) eyepieces I got together with the purchase of telescope. 1) The build quality is not bad. Better than what I expect. The 23mm one is huge at hand and 10mm one is actually smaller than 4mm one. I would say 3/5 2) The optical quality is very good. The view is crystal clear and no apparent distortion. For 4mm one, the view is actually very crisp except for darker background. 4/5 3) The wide angle view is indeed with what it claimed. Viewing from 23mm even gives me a feeling like watching stars through a spaceship windows... 3/5 4) The eye relief is not very long but not bad. For 23mm, I can easily look through it when I wear eyeglass. Looking through 4mm is a little bit of harder to watch through with glasses but much better than my SR4, which is simply not possible. 2.5/5 5) The cost for those three pieces is low. $12 each. 5/5 Overall, I would like to see that these eyepieces are well built, crispy clear and having wide angle view as advertised. In my opinion, if your budget is only about $50 and still want 3 decent eyepieces , this item is one ultimate budget choice.

This can suit your telescope well, high power eyepieces are a bit better than Barlow lens for clarity and keeping the weight down, especially for planetary use. It suits my 115mm refractor. Check the max useful magnification of your telescope before you buy a high power eyepiece like this one. I like the wider field of view and the low cost of this eyepiece. I have an 8mm wide field planetary eye piece from Orion which has better set of optics and better quality but costs 6 times more than this one. This one does seem to introduce slight aberration and is not as clear as the Orion. However, the 4 mm gave higher magnification when I needed a more zoomed in view of the Moon, Jupiter and Saturn. Moon filter is a must of course as they reduce glare. I have not tried this on DSOs as I stop at the 8mm magnification for them. For terrestrial use in the daytime it seems to be pretty good upto 500 yards, not really as good quality wise for the night sky because of the chromatic aberration it introduces always, but given the low cost it has a place in my set of eyepieces and it will be an ok choice for amateur astronomers. The chromatic aberration is significant even at the day/night boundary of the moon, so it will come in the way of observing crater details. So this eyepiece is nor suitable for those boundaries where the aberration becomes significant. If you have a telescope bino viewer, you need a pair of these 4mm ones, as it is expensive to get higher quality ones. I recommend getting these for planetary use. This is a good buy, overall, 3 stars, I recommend it as long as you are not looking for a high quality image as the difference will be significant, the Orion one will be much better and a 400 dollar eyepiece from TeleVue will be much much better.

With the current gold line and red line sets I'll call these the bronze line. Basic and cheap but more below. I am still learning collimation but I used a svbony laser collimator and supplied collimation cap and appears to be focused... They seem good, better than the 10mm and 25mm my virtuoso gti 150p came with. No eye cups. Didn't realize until I got them. Bought as 4mm 10mm and 23mm set, came in separate boxes In a plastic bag with dust caps on both ends. The 4 mm I didn't get the test during night but during day it seems ok for price. Dim and a little out of focus but might be me or the limit of my equipment or how i tested it. I did collimate but not going to knock it yet. The 10 mm was nice during night and day use, I have very little experience with other eyepieces other than the 'scope supplied 10mm and 23mm. Great views of full moon The 23mm was odd, mine has a part of it that screws loose or tight at where you place into the 1.25" focuser. The silver part unscrews and I don't want to fully unscrew and damage or ruin it. Not sure if designed like that or a quality control issue. Works great other wise. Lol, turned it tight and it seems fine. Nice view of full moon. Two pics are one photo, but zoomed in on the second one. I just held an s20+ up to eyepiece. Don't remember which eyepiece I used, 10mm or 23mm might have used a 2x svbony Barlow. Second picture is an edited picture of the moon. More contrast and sharper to show details. Seems like a good starter set. Recommended brand. Getting the upgraded and seemingly well reviewed red line set soon..

Bought to use with a 5" Newtonian Reflector. They add a lot more choice when viewing planets and celestial objects. The clarity is superb, as is the quality of the eye pieces. They are far better than the telescope I am using them in, so I guess I am going to have to buy a better one. The only way these could be improved is if they came with a storage case.

pas très lumineux

Como na descrição recomendo

Este set de oculares para telescopio SVBONY me parece una gran opción para reemplazar los oculares de entrada con los que un telescopio para iniciar podría venir; son ligeros pero de cuerpo metálico y detalles en goma; son de medida estándar 1’1/4 de pulgada por lo que su compatibilidad con gran variedad de telescopios no será un problema Cuentan con una cuerda interior para añadir filtros de la misma medida y una cintura moldeada en el cuerpo metálico para fijarse con mayor seguridad al telescopio o a los accesorios; son totalmente compatibles por ejemplo con la lente Barlow 2x de SVBONY por si se quiere añadirla o ya se tiene una Un punto a destacar es que son oculares de campo amplio, se menciona 62 grados ; comparados con oculares convencionales las observaciones que ofrecen no se parecen en absoluto; después de usar dicha configuración de ocular no querrás utilizar otros ya que en los convencionales (sobre todo cuando aportan grandes aumentos) observar a través del ocular es cansado y difícil por el pequeño diámetro de la lente pero en los de campo amplio resulta muy fácil observar por periodos más prolongados. En las últimas fotos comparo unos oculares de entrada de 20 y 4 mm contra los oculares 23 y 4 mm de este set; la diferencia en el diámetro de la lente a través de la cual observas es evidente y ello se traduce en una mejor experiencia de observación Con respecto a la calidad de imagen, un telescopio de entrada mejora mucho su potencial al reemplazar los oculares por otros de mejor calidad y este set me parece muy accesible en precio con respecto a lo que ofrece; de igual manera la forma asférica que menciona el ocular puede potencialmente corregir aberraciones cromáticas inherentes al diseño o construcción del telescopio, por ejemplo en un reflector con espejos esféricos En conclusión considero que por el precio este set puede mejorar la observación usando un telescopio de entrada, aportar variedad si tienes pocos oculares y no quieres invertir mucho o si nunca has probado un ocular de campo amplio

Ordered for my grand father and he loved it