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Celestron Omni Series 1-1/4 4MM Eyepiece

4.4 out of 5 stars 250 customer reviews
| 66 answered questions

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Omni Eyepiece
1.25" 4 mm
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  • This Item Includes: Lenscaps - 2-Year Warranty
  • 4 Element premium symmetrical optical designs
  • Fully Multi-Coated
  • 52° Field of View
  • Blackened lens edges
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$19.95 & FREE Shipping on orders over $49. Details Only 14 left in stock (more on the way). Ships from and sold by Amazon.com. Gift-wrap available.

Frequently Bought Together

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Technical Details


Product Description

Style: Omni Eyepiece | Size: 1.25" 4 mm

Celestron 1-1/4 in. 4 mm Omni Series Eyepiece is designed with the finer points in mind so you, the user, can benefit from the features that make this series unique. Celestron 1-1/4 in. 4 mm Omni Series Eyepiece features include blackened lens edges to minimize internal reflection and maximize contrast, multi-layer coating group on each lens surface to maximize light transmission and contrast, and each Omni goes through a two-step anodizing process to prevent reflection from the top eyepiece barrel, unlike most other manufactures who use reflective surfaces. The Omni is a 4 -element premium symmetrical Plssl optical design. Threaded barrels accept 1-1/4 in. Celestron thread-in filters.

Product Information

Style:Omni Eyepiece  |  Size:1.25" 4 mm
Product Dimensions 3.4 x 1.7 x 1.4 inches
Item Weight 1.8 ounces
Shipping Weight 1.8 ounces (View shipping rates and policies)
ASIN B00008Y0S5
Item model number 93316
Customer Reviews
4.4 out of 5 stars 250 customer reviews

4.4 out of 5 stars
Best Sellers Rank #41 in Camera & Photo > Camera & Photo Accessories > Telescope & Microscope Accessories > Telescope Accessories > Eyepieces
Date first available at Amazon.com March 19, 2003

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Customer Questions & Answers

Customer Reviews

Top Customer Reviews

Style Name: Omni EyepieceSize: 1.25" 32 mm Verified Purchase
I wanted the widest eyepiece I could afford that I could use with my Celestron Omni XLT 120 refractor. I purchased the 40mm version first before buying this thinking I will get the widest view because of the longer focal length. The 32mm eyepiece has an apparent field of view of 50 degrees whereas the 40mm has a 43 degree view. I had overlooked this but waited for both the eyepieces to arrive so that I can test it myself and compare them both in my scope which has a 1000mm focal length.

Both of them are pretty sharp but start getting slightly blurry towards the edges which is expected for eyepieces in this price range. The 32 mm has a slightly wider view than the 40mm. This might be because of the 1.25 inch format of the eyepieces which restricts wider views beyond a point. That's why it makes sense to go for 2 inch format eyepieces which have larger openings for wider field of views provided your focuser supports it. What I noticed was that the 32mm's slightly wider view was also slightly more magnified than the 40mms because shorter eyepiece focal length translates to more magnification.

I tested it in clear skies last week and the Pleiades cluster still doesn't fit into the field of view with the 32mm but it still provided bright crisp views almost to the edges. The star cluster just spills outside the field of view but note that my scopes focal length is 1000mm which is not a wide scope.

The finish and build of the eyepiece is very good and the rubber eye cap is excellent and very useful if you wear glasses like me. Even otherwise, it acts as a shield preventing stray light degrading your image. The eye relief is good as well.

The conclusion - the 32mm is a clear winner here and I don't understand why Celestron would even offer a 40mm version in 1.25 inch format. I am going to be returning the 40mm and I hope this experience helps others in making a decision if they are confused.
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Style Name: X-Cel LX EyepieceSize: 1.25" 9 mm
Eyepieces (EP) are like home entertainment speakers. Until you've listened to them and compared them against other speakers you really have no idea how good they are. That being said, these are very good, nearly "spectacular view" EPs. I own the 25mm, 18mm, 9mm and I use them in my 11" (f10/6.3) Schmidt-Cassegrain Telescope (SCT). I use the 25mm EP as my wide field nebulae EP. The Orion nebulae (M42) looks 3-dimensional through this EP and I actually said "WOW" the first time I used it and I've been looking at Orion for 42 years! I use the 18mm for globular clusters, the Hercules Cluster (M13) can be resolved to the center with ease. I use the 9mm for the planets and planetary nebulae.

I own 12 EPs: Plossls, Erfles, Orthoscopics and Kellners, these X-Cel EPs are the 3 I use most often.

Some other reviewers have said that the "Cons" are "heavy" and "bulky". To me this is not a "Con". These are well constucted, solid feeling EPs that are easily handled with gloved or cold hands.

There are better EPs, but not at this price. To me, these are the most bang for the buck!
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Style Name: X-Cel LX EyepieceSize: 1.25" 25 mm Verified Purchase
I guess you would consider the X-cel eye piece the 3rd tier offering from Celestron (2 up from the eye piece that comes with scope) and let me tell you what a diiference!!

To start off with the build quality is vastly superior than that of the standard eye piece and there is a significant weight difference (X-cel the heavier). There is also a noticable size difference that Im sure has to do with whats held inside. The adjustablity is also a huge plus and it comes in its own sturdy container for storage.

But what really matters is the perfromance and all I can say here is Wow! The field of view is significantly better. The images are crisper any clearer. Color seems more vibrant and light artifact at the edges of the eye piece seemed markedly reduced. All this for what I feel is a fairly reasonable price ($59.95 sale-%79.95 normal); especially when compairing them to Televue ($200+).

Give this brand a shot you wont be disappointed.
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Style Name: X-Cel LX EyepieceSize: 1.25" 12 mm Verified Purchase
I purchased this eyepiece to bridge a magnification gap that I had with my 150mm F12 Mak, producing 150 power magnification. I am quite pleased with the performance of this eyepiece for its costs. Images are uniform across the field of view from what I can tell. I use this eyepiece quite a lot when observing Jupiter, Saturn, Mars (when at opposition) and the moon.

When I have to move my scope around my yard to avoid trees and other viewing obstructions etc...(suburbs), this is one of the four eyepieces I grab and put in my jacket and take with me, the others are my orion expanse 20mm, teleview type 4 nagler 17mm and orion expanse 9mm.

For me this eyepiece seems to work well enough for me to be a litmus test on how good the atmosphere is, if I can bring an image into good quality focus in this eyepiece then I have a steady atmosphere and can then try to use other eyepieces that provide higher magnifications. I know one time I observed Jupiter over a nearby rooftop and I was able to see the heat distortion/disturbance in the air ripple across the face of Jupiter; the plus side of this being this eyepiece was able to capture that effect, the downside of this was that I was done looking at Jupiter from that location that evening.

I am thinking about getting the 9mm version of these to compare it's performance in my 6" F12 Mak to my orion 9mm. Despite my budgetary limitations and constraints this is something that I ponder. I seem to have an very little difficultly getting this 12mm into a sharp focus at 150x, so I wonder if I'd have an easier time with the celestron 9mm than my orion expanse 9mm at 200x.

This eyepiece produced an impressive 150x image of Mars Apr 20th 2014, when we had a very stable atmosphere for N. Virginia.
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