Astromania 4mm 1.25 Inch Plossl Telescope Eyepiece - Fully Multi Coated 4-Element Plossl Design Telescope Accessory with Standard 1.25 inch Filter Threaded for Visual Astronomy Observations
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Availability:
13 left in stock
Arrives
Mar 8 – Mar 19
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Size: 1.25" - 4mm
Features
- Premium Optical Device: Aluminum alloy material is used to make it last longer; perfect for broad-field lunar observations; medium-sized star clusters and a wide range of cloudy nebulae; obtaining better observation results during astronomical journey
- 50 Degree Field of View: 1.25 inch 4 mm plossl eyepiece set offers a wider 50 degree field of view and a 4 mm focal length for observing larger objects; giving the wider view field along with extra sharpness and long eye relief
- Fully Muti-Coated Optical Lens: 4-Element Optical Lens; providing bright; sharp images and excellent color correction and the fully coated groups on each lens surface maximize light transmission; contrast; and image clarity
- Wide Range of Compatibility: Standard 1.25 inch female thread can be connected with 1.25 inch focuser of telescope or any other 1.25 inch telescope accessories. Threaded for standard 1.25 inch astronomy filters and barlow lens
- Exquisite Detailed Design: Fold-down rubber eyeguard offers a soft cushioned surface; the matte blackened lens edges effectively prevent stray light; coming with sturdy plastic dust caps-protect the eyepiece from dust and moisture
Brand: Astromania
Model Name: PLOSSL 4mm FULL
Eye Piece Lens Description: Plossl
Objective Lens Diameter: 4 Millimeters
Telescope Mount Description: Altazimuth Mount
Focus Type: Manual Focus
Finderscope: Reflex
Item Weight: 2.22 Ounces
Compatible Devices: Telescope, 1.25 inch astronomy filters, Barlow lens
Lens Coating Description: Multi-Coated
Product Dimensions: 3.24 x 1.89 x 1.77 inches
Item Weight: 2.22 ounces
Item model number: SKU_AM_PT14
Is Discontinued By Manufacturer: No
Date First Available: August 17, 2015
Manufacturer: Astromania
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If you place your order now, the estimated arrival date for this product is:
Mar 8 – Mar 19
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
Size: 1.25" - 32mm
I have been quite impressed with the eyepieces in this lineup. I've seen what appear to be the same eyepieces sold under several different brands, and all of them appear to be very high quality. This is the first one I've purchased through Amazon, so I thought I'd go ahead and share my impressions. Quick summary for those who don't like to read: Pros: -Sharp images with a wide field of view -Safety undercuts in barrel keep it from accidently falling out of focuser/diagonal -Lens is less recessed than others making it easier to get to when it needs cleaning -Excellent value for the price Cons: -Doesn't appear to have the best anti-reflective coatings -No rubberized grip My obvious comparison is with my set of older Meade 4000 Super Plossl eyepieces. I've put the Astromania 32mm side by side with the equivalent Meade 32mm for comparison. Using them both at night it's hard to tell much difference between them, at least to my amateur eye. The Astromania eyepiece is nice and sharp, with a nice field of view and comfortable eye relief. It has a nice heft to it and feels like it's made of quality materials. It doesn't have the grippy rubber surface on the sides the old Meade does, but then again neither does the current generation Meade 32mm eyepiece. In fact, these may be identical to the current generation Meade eyepieces. I see that Astromania has an eyepiece set with case that appears to be remarkably similar to the Meade set. The Meade does seem to have better anti-reflective coatings, perhaps as evident by the "Fully Multicoated" on the label as opposed to the "Fully Coated" label on the Astromania eyepiece. In the side-by-side shot you'll see more light reflected from the Astromania. It's obvious in the photo the Meade has a greenish sheen to it but the faint purplish sheen on the Astromania eyepiece doesn't show up. In practice though I don't notice much difference, at least in my light-polluted yard. There may be more internal reflection when looking at bright objects but if so it's not enough to bother me. One thing I liked was that the top lens was less recessed than the Meade, which seemed to make eye placement easier for me and also makes it easier to get to the lens when you need to brush dust off. Both have enough eye relief that I don't have the trouble with getting eyelash oil all over the lens like I do with some of the shorter focal length models. I've purchased quite a few of these eyepieces: 32mm (3), 25mm (3), 20mm (2), 12.5mm (6), 10mm (2), 6mm (4). Mostly they were bought as relatively inexpensive upgrades for the crummy "stock" eyepieces that came with entry-level telescopes I purchased as gifts for friend/family. In that regard these are a match made in heaven. The price is similar to the "Series 500" Plossl eyepieces I've seen sold under different brands as well, but these have noticeably wider fields of view than the Series 500 eyepieces I've tried (30mm, 15mm, and 10mm). I spend more time than probably just about anyone fooling around with small, inexpensive telescopes. I have found that most budget entry-level telescopes, even name brand ones (Celestron Powerseeker line), have decent main optics but come with low quality Huygens and Ramsden eyepieces to keep the price down. Perhaps worse, they often come with focal lengths chosen only to advertise unrealistic (and unusable) magnification powers. It's no wonder so many people buy telescopes and never use them more than once or twice. I can't stress enough what a difference it makes to have decent quality eyepieces in sensible focal lengths: one to provide 20-30x magnification, one to provide max magnification (the main lens/mirror diameter in mm times 2), and one or to two fill in the gap in between low and high. These Astromania Plossl eyepieces provide a good way to do exactly that without breaking the bank, and this is what I love about them: they're an affordable way to significantly upgrade your telescopes. Even if the scope comes with the more acceptable Kelner or Modified Achromat (MA) eyepieces (like Meade's entry-level scopes do) you'll still see a noticeable difference when upgrading to Plossl eyepieces. Best of all, if you eventually upgrade to a bigger and better telescope these eyepieces will still be useful, making them an investment in the future. All things considered I've been very pleased with every one of these eyepieces I've purchased. As an upgrade for entry-level telescopes they're an unbeatable value. I recommend them without hesitation.
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Reviewed in the United States on August 14, 2017 by Waylon Waylon
Size: 1.25" - 6mm
Really nice quality eyepiece from Astromania! I purchased the 6mm Plossl and it gives me a beautifully sharp image in my telescope. Apparent field of view (AFOV) is surprisingly good and stars are pinpoint in the entire field with no stray reflections. Only minor nitpick is because it's a high power/short focal length eyepiece, the eye relief (the distance your eye has to be while looking through the lens of the eyepiece where you get a good amount/all of the full field of view) is pretty short. You really need to scrunch your eye in to get as wide a FOV as possible. However, still a solid eyepiece for an incredible price!
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Reviewed in the United States on August 13, 2025 by MoeD
Size: 2" - 56mm
Well made. In daytime with an f/4.7 apochromatic telescope this eyepiece is like a panoramic window. At night, stars are sharp, there is perhaps a barely visible distortion at the edges but truly minor. Frankly my eyeglasses cause more distortion than this eyepiece. I didn't notice reflections even looking at bright objects. This is an excellent value if you like wide field views. It appears to me that not all the lens elements are multicoated. Also you need a telescope capable of a very long back focus distance to use this eyepiece. You might need a right angle mirror or prism to get images into focus because of the long distance required. For the price, it's a lot of fun.
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Reviewed in the United States on July 11, 2024 by Roger E. Ison
Size: 2" - 56mm
Good quality telescope piece. It fits well and has good clarity. Very easy to use.
Reviewed in the United States on November 2, 2025 by Tricia C.
Size: 1.25" - 4mm
I will go with,.. 5 stars for pricepoint vs. performance. Used them on a celestron 114lcm ,.. 4.5 inch tube,.. magnification at about 250x,.. A bit beyond what is recommended, per the 50x per inch zoom rule of thumb, Saturn visible with a bit of distortion, saturn rings this time of year/decade are sideways fully so they fade out beyond what is resolvable, will update in 8 months when rings are expected to be visible slanted. Went with a 4mm because 4.5mm item from another brand (recommended maximum for my telescope) was at 60usd, and not attractive for amateur/hobby price range
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Reviewed in the United States on November 21, 2025 by David Rivas
Size: 1.25" - 6mm
“This Astromania eyepiece exceeded my expectations. The clarity and sharpness were noticeably better than the stock eyepieces that came with my telescope. Stars appeared crisp with very little distortion at the edges, and the viewing comfort was excellent even during longer sessions. The build quality feels solid, with smooth adjustments and no wobble when focusing. I bought this eyepiece to expand my viewing options, and I ended up loving it and keeping it. It’s a great upgrade for anyone looking to improve their telescope setup. Highly recommended.”
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Reviewed in the United States on September 22, 2025 by Amazon Customer
Size: 2" - 56mm
This eyepiece is great. Tried it out last night, and it provides nice crisp wide-angle views. It is big but not outrageously so. Just slight larger in diameter than my E-lux 40mm that came in a Celestron accessory kit, but about an inch or so longer. For the price, a great value. The main reason I did not give it 5 stars is because it did not come with caps to protect the lenses. Seems like a cheap no-brainer to me, but what do I know. Also, before you buy this eyepiece, you should be aware of the exit pupil it provides. For example, with my 102mm refractor, it gives an exit pupil of 9.5mm. Since that is larger than the average max pupil size, there will be some light that the eye simply cannot make use of, as I understand it. I'm relatively new to this hobby, so I can only speak from my limited experience, but in practical terms with a fast f5.9 scope this didn't have too much of an adverse effect on the views for me. I thought maybe it was a little dimmer than I was used to, but that could have been partly attributed to the lower magnification, I think. Either way, I am overall happy with this purchase. Just wish they'd sent caps to cover the lenses.
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Reviewed in the United States on July 31, 2016 by TDK
Size: 1.25" - 25mm
Nice eyepiece!
Reviewed in the United States on November 15, 2025 by Doug Fuhrman