Celestron 40mm Omni Series 1.25 inch Eyepiece
Celestron Omni: Picture 1 thumbnail
Celestron Omni: Picture 2 thumbnail
Celestron Omni: Picture 3 thumbnail
See all Celestron items
23% Off

Celestron 40mm Omni Series 1.25" Plossl Eyepiece with 43 Degree Field of View.

SKU: CN40O MFR: 93325
(46)3 questions, 16 answers
$52.95
$68.95
Save: $16 (23%)
Earn VIP Reward Points

Key Features

  • Enjoy wide, 43-degree views with this 40mm Celestron Omni telescope eyepiece!
  • Experience comfortable observing sessions with the eyepiece's generous 31mm eye relief.
  • The 1.25" barrel diameter makes this Plossl eyepiece compatible with many telescopes.
  • Achieve optimal image clarity thanks to the high-quality lens design of this eyepiece.
  • Explore deep-sky objects or lunar details with enhanced magnification using this lens.
  • This Celestron 40mm eyepiece offers great value and performance for astronomy enthusiasts.
See More Product Details

Product Options

FREE 2-Day Shipping

See Options

Qty
1
Add to ListGet Sale Alert

Protect your gear with Adorama Protect.* Learn more

1 Year

$4.99

2 Year

$7.99

3 Year

$13.99

Available to U.S. customers only.

Need help? Ask our experts.

Overview
Compare
Accessories
Specs
Protection
Q&A

Questions & Answers

RICHARD S : Good afternoon, I`m trying to get a better more powerful eye piece for my celestron. LCM 80. it came with a 25mm and a 9mm eye piece would the 40mm be more powerful and if not what would I need to be a bit more powerful?DAVID H : A 40mm lens would be less powerful. Magnification is calculated by dividing the telescope focal length by the lens focal length. Your telescope has a focal length of 900mm. The magnification for various lenses would be: Lens Mag •40mm900/40= 22.5X •30mm900/30= 30.0X •25mm900/25= 36.0X •20mm900/20= 45.0X •15mm900/15= 60.0X •10mm900/10= 90.0X •9mm900/9= 100.0X •5mm900/5= 180.0X I believe Celestron has a 6mm lens in the same Omni series. That would give you a magnification of 150X. The 40mm will give you better views of deep space objects (large but faint). The smaller lenses are generally for planetary viewing. Keep in mind that as you ramp up the power, any little bump or vibration will have a greater effect in the eyepiece. It might be best to find a local star party and ask to try someone else's lens to see how they work with your telescope.JAMES R : I had the same thought: I want to see closer. Let me know your decision.JEFF C : If powerful means magnification the smaller the size the greater the magnification. I would say your 9mm eyepiece is plenty powerful. There are smaller eyepieces though.Hart S : Your 9mm eyepiece yields 100x power, which is about the practical limit for your telescope. The 9mm eyepiece is more powerful than the 25mm, which is more powerful than the 40mm. Divide the focal length of your telescope (900mm) by the focal length of the eyepiece to get magnification power. Your viewing experience will dramatically improve with a better 9mm eyepiece, perhaps something in the $40 to $90 range.
doug t : will this lens work on a discovery kids telescpoe 1.25in?Hart S : In a nutshell, YES. The 40 mm will give you a little bigger view while a 32 mm gives you a little more magnification. Go for the 40 mm.RICHARD D : I was unable to locate your scope using the terms: "Discovery Kids Telescope 1.25", so I am not exactly sure what you are dealing with. I would first check to make sure that your focuser accepts 1-1/4" (1.25) eye pieces. You can measure the outside diameter of the barrel that slips into the focuser on one of your existing eyepieces to make sure. Also be sure you want a low magnifcation eyepiece suitible for viewing starclusters and wider areas of the sky because that is where this eyepiece is best suited. I own this eyepiece and it is of fine quality, but I think if i had to shop this category again I would choose the 32mm Omni eyepiece. The 32mm Omni will show you the same slice of the sky but the objects will appear just a bit larger. I would like to quote an article I found on the subject: "The apparent field of view (AFOV) of the 32mm Omni is 52-degrees and the AFOV of the 40mm is 43-degrees, due to vignetting caused by the 1.25" mounting barrel. This result of this difference in AFOV is that in any given telescope the 40mm and 32mm Plossls have essentially the same actual field of view. The 40mm is brighter because it has a larger exit pupil, while the 32mm makes everything in the field of view larger." - Believe me, the difference in brightness at this focal lenth, 32mm to 40mm is a non-issue. In summary, you can't go wrong with either piece at these prices but your best bang for your buck is the 32mm.CRAIG R : Hi Doug, I'm not familiar with that specific scope, but this eyepiece will fit any scope that uses 1.25" eyepieces. When you use an eyepiece like this, you'll find it gives you less magnification, and shows you more of the sky. That is nice for things like star clusters that are too wide to fit in your scope's view with higher magnification. But when I want to look at the moon, for example, I use eyepieces with more magnification and a narrower view. In my scope a 25mm eyepiece shows the whole moon and fills up the view pretty nicely. If I want to zero in on features of the moon, I can use a 12mm eyepiece to look closer, but it shows less of the moon. You may already be familiar with how to calculate magnification power for your scope, but I'll throw this in just in case you aren't. First you need to know the focal length of your scope. Sometimes it is printed on the scope, but if not, you should be able to find it in the manual. Then divide the focal length of the scope by the focal length of the eyepiece. That tells you the magnification power. For example, in my scope with a 900mm focal length, this 40mm eyepiece gives 22.5X power. Then you can calculate the actual field of view by dividing the "apparent field of view" for the eyepiece by the magnification. Hope that helpsJOSE M : I checked the Discovery Channel store and not all the scopes indicated the eyepice format. The Celestron 40mm Omni eyepiece will fit any telescope as long as they are 1.25 in as you indicated yours was. I own one of these eyepieces and can tell you it is an excellent eyepiece at a great price. Please note that the higher the focal length of the eyepiece (in this case 40 mm, which is considered high), the lower the magnification you'll get from your telescope.BUSINESS O : Yes -- probably. A 40mm eyepiece is a good eyepiece to start observing with. It has a wide field of view which makes acquiring new objects easier. Not sure which telescope you are referring to specifically, but typically there are two sizes of eyepiece and this plossal will work in a telescope typically designed for kids. (The other size tends to be put in larger telescopes that are more permanently mounted). Hope this helps.
Shopper : Why Did You Choose This?JEFF B : to go with my first telescopeDAVID C : 40 mm is the size I want. I have a 2x and 3x Barlow. Plenty of power for my 4 1/2 inch scope. Price and delivery time were factors in this choice, and Celestron is a reasonable (I hope) quality brand.Josh R : I want to see as much as possible in the sky with my Celestron, we’ve been able to see some cool things with just a 15mm lens so this is exciting!JOHN M : Replacement for lost 40mm (Original C8 "Orange Tube" 1977!). Need a wide field eyepiece.RAYMOND M : More powerful lens than i currently have.RICKY M : Experiment

Reviews about this item

Review Summary

2024-03-31T08:40:18

Rated 5 out of 5

Eye Candy!

I needed a quality built low power, wide field eyepiece for my new 9.25" Edge HD OTA that also wouldn't break the bank. This 56mm eyepiece fits what I have wanted. My eyesight isn't as good as it once was so I hope this 56mm eyepiece will make viewing the cosmos more efficient. We have had a pretty lousy late winter/early spring as far as cloud cover, wind, snow and rain showers and I haven't had any real opportunity to view through this eyepiece, What I can say is this eyepiece is much lighter than the 23mm eyepiece that came with my OTA. This eyepiece has made balancing my OTA easier.

John P.

2023-01-05T06:27:56

Rated 5 out of 5

Telescope accessoriies a great deal

The eyepiece I ordered arrived on time for Christmas and in good condition. Adorama carries telescope parts and accessories at a reasonable price. Recommended.

JO S.

2021-12-13T08:53:14

Rated 5 out of 5

Nice lens

Seems to be pretty good. I have a 4 1/2" f:8. I haven't actually looked at the night sky with it, but the phone pole a half mile away comes in quite clearly. "High Voltage" sign crystal clear.

DAVID C.

2021-10-26T04:57:15

Rated 5 out of 5

Great useful eyepiece

Use it constantly. Great bright eyepiece.

Charles V.

2021-10-08T08:31:43

Rated 5 out of 5

good value

Good quality product

Ricky M.

2021-10-08T08:31:10

Rated 5 out of 5

Lens

Good value.

Ricky M.

2021-05-06T18:28:10

Rated 5 out of 5

Lenses

Works great. Nice sharp image. Will continue buying Celestron lenses from this company.

ERIC B.

2021-03-08T02:51:26

Rated 5 out of 5

Amazing!

I love this lense! Perfect for my Celestron telescope. You can see everything in the sky!

BRITTANY M.

2021-01-29T07:39:54

Rated 5 out of 5

No complaints

Good quality eyepiece. Yes, the field of view is a bit tight, but good for initial alignments/adjustments.

Nathan C.

2020-11-18T08:42:04

Rated 5 out of 5

Very nice Barlow lens

This is a great little Barlow lens. It's easy to use with my 1.25 size eyepiece.

MIKE R.

2018-09-28T08:47:24

Rated 5 out of 5

It did exactly what it advertised it could do

It did exactly what it advertised it could do. I did not like the original "finder scope (two small red dots of light) that came with my telescope. By decreasing the magnification of my eyepiece from 20 mm to 32mm I was able to ALMOST turn my entire telescope into a "finder scope". I only wish I had bought something like a 40mm which might have worked even better. But alll the 40mm I saw had a narrower field of view than ADORAMA"S 32mm.

Carl W.

2018-08-16T21:11:40

Rated 5 out of 5

Good value

Good quality for price

STEPHEN P.

2018-08-02T12:58:06

Rated 4 out of 5

See More with Barlow

I was given a telescope from a friend. We loved what we saw qnd wanted to see even more; bought a Barlow to double our enjoyment.

RAYMOND C.

2018-05-08T14:35:16

Rated 5 out of 5

Excellent ocular at a very low price.

These rival the $ eyepieces. Great optics and nice eye relief.Try one, particularly if you wear glasses.

Hart S.

2017-09-10T12:46:10

Rated 5 out of 5

Great planetary eyepiece for long refractors

Nice heavy, well made eye piece. I use the 15mm on a 60mm f13 scope, as my planetary eyepiece. The Images are crisp, edge to edge. Also great for splitting doubles.

Andy B.

2017-03-17T08:34:18

Rated 5 out of 5

Good stuff

This was an easy and inexpensive way to modify our telescope. My 3yo loves that he can now see clear views of Jupiter and it's four moons. The site was easy to explore and the next time I look to upgrading my telescope, we'll be back.

Andrew M.

2017-03-02T10:33:34

Rated 2 out of 5

Nice finish but optics is not match up

It has a nice finish overall but the optics is less then desired. For the price meade 4000 series 40mm possl would perform better then this.

Andromeda

2017-02-25T11:42:23

Rated 5 out of 5

Good quality product

Nice accessory for a telescope. Easy to use, well built, should give many years of service.

Weldon K.

2016-11-17T10:34:23

Rated 3 out of 5

Decent quality for the price

The quality is ok for the price, but the angle of view is quite small (barely covers the moon) and with the celestron cometron telescope, I have to keep adjusting the position of the telescope which causes shake all the time. If your telescope's mount is alt-azimuth mount, then this is the problem with such a small angle of view.

Kushal B.

2016-10-27T08:38:01

Rated 4 out of 5

Excellent customer service

I ordered a Meade laser collimator and was informed that it was on backorder. I called customer service and was able to modify the order. Adorama made the process quick and easy. I have a high level of confidence in your company. You will be my first choice for any future purchases.

Harvey K.

2016-09-29T08:45:09

Rated 5 out of 5

great eyepiece!

i really love this eyepiece! it's perfect fot deep space

Cesar G.

2016-09-21T07:57:32

Rated 5 out of 5

Pinpoint star images

Yes. Nice crisp images to the edge. I can wear my glasses with the long eye relief so I don't have to take them on and off when looking at info from my goto hand controller.

Robert B.

2013-06-24T21:00:00

Rated 4 out of 5

Very clear View

I use this eyepiece on my Celestron NexStar 6SE and it provides beautiful wide field views of stars and objects.

Baltier

2013-04-25T21:00:00

Rated 5 out of 5

Plossl Eyepeice with some flair!

Great upgrade to the eyepieces provided with my telescope. Had to get a special adapter for my digital camera use but may well be worth it based on my naked eye usage so far. Bright and sharp to the eye.

Charlie

2013-02-04T19:00:00

Rated 5 out of 5

Great Eye Relief for Eyeglass Wearers

I am using this eyepiece on a Celestron C70 for terrestrial viewing via the standard eyepiece adapter supplied with the C70. This gives me a bright clear image with a magnification of about 18. The feature I like best is the long eye relief because I wear glasses. This eyepiece is longer and heavier, however, than the zoom eyepiece that comes with the C70.

Paul H.

2013-01-28T19:00:00

Rated 5 out of 5

This lens is as advertised.

Great for closeup viewing of the moon.

Dick

2013-01-21T19:00:00

Rated 4 out of 5

It worksfor me !

I recently purchased this item for my Celestron NexStar 5 SE telescope and I was impressed with its construction and optical quality. It performed well even in the light polluted area of Bergen County where I reside. Also the price was right when compared to other vendors.

FATUZZO J.

2012-07-08T21:00:00

Rated 5 out of 5

A GREAT accessory added to my bag!

I like having this piece, I use it all the time, and it's easy to use.

Crackus

2012-05-13T21:00:00

Rated 5 out of 5

all the bells and whistels...

this barlow is amazing. i haven't been into astronomy very long, but i have used a few other barlows from other companies. this barlow improves the clarity of even the most generic eyepieces. i could see saturn clearer than i have ever seen it before. will deffinatley recomend this product to anyone...

c-dub b.

2012-05-13T21:00:00

Rated 4 out of 5

Celestron 40mm Omni 1.25 Plossl Eyepiece

I enjoy using this eyepiece for viewing nebula, galaxies and other relatively large field objects. It produces a nice wide crisp view. It is also handy when trying to locate objects before upping the magnification.

Jim

Select a plan in the Add Protection section above and purchase with this product by clicking “Add to Cart”.

image-protection

TRUSTED PROTECTION PLANS, EXCEPTIONAL SERVICE.

Invest In Your Gear and Peace Of Mind!

Accidents happen. Protect your favorite Adorama products and purchase a protection plan to stay covered from accidental damage, mechanical or electrical failures, and more.

Repair or Replacement

Repair or Replacement

If we can’t fix it, we’ll replace it at no additional cost.

Accidental Damage

Accidental Damage

Protect your product from drops, spills, and more.

Peace of Mind

Peace of Mind

Enjoy your gear without fear. We have you covered!

Failure Protection

Failure Protection

When regular use of your product over time results in mechanical or electrical failure.

Zero Deductible

Zero Deductible

We will never charge you a deductible after the purchase of a plan.

Customer-Focused Support

Customer-Focused Support

Our claims process is simple & easy and our customer service team is happy to help.

Adorama Protect powered by Extend is available for purchase to customers in the United States. Not available for international or U.S. territories purchases. Plans on open box items do not cover pre-existing damage.
Adorama Protect plans are available for ABS clients. If you have any questions or require assistanse, please call 800-223-2500

Browse our FAQ

See Terms & Conditions

Celestron Omni Specifications

  • Focal Length

    40mm

  • Apparent Field of View

    43 Degree

  • Eye Relief

    31.0 mm

  • Eyepiece Barrel Diameter

    1.25"

  • Field Stop Diameter

    Not Specified by Manufacturer

  • Dimensions

    Not Specified by Manufacturer

  • Weight

    Not Specified by Manufacturer

  • Package Weight

    0.4 lb

  • Box Dimensions (LxWxH)

    4.5 x 2 x 1.12"

  • UPC Code

    050234933254

7 Accessories for Celestron 40mm Omni Series 1.25" Plossl Eyepiece with 43 Degree Field of View.

  • All Accessories (7)
  • Cleaning Accessories (1)
  • Eyepieces & Accessories (3)
  • Filters (3)
Celestron LensPen Optical Cleaning Tool
Celestron LensPen Optical Cleaning Tool
$12.95
Recommended
Celestron 45 Degree Angle Erect Image Diagonal 1.25"
Celestron 45 Degree Angle Erect Image Diagonal 1.25"
$44.95
Recommended
Celestron 1.25 inch UHC / LPR Filter
Celestron 1.25 inch UHC / LPR Filter
$94.95
Recommended
Celestron 2x1.25" Omni Barlow Lens
Celestron 2x1.25" Omni Barlow Lens
$41.95
Celestron 90 Degree Angle Star Diagonal, 1.25"
Celestron 90 Degree Angle Star Diagonal, 1.25"
$44.95
Celestron 1.25 inch Oxygen III Narrowband Filter
Celestron 1.25 inch Oxygen III Narrowband Filter
$79.95
Celestron 1.25" Moon Filter
Celestron 1.25" Moon Filter
$12.95

About Celestron Omni

FEATURED REVIEWS

It did exactly what it advertised it could do

By Carl W.

It did exactly what it advertised it could do. I did not like the original "finder scope (two small red dots of light) that came with my telescope. By decreasing the magnification of my eyepiece from 20 mm to 32mm I was able to ALMOST turn my entire telescope into a "finder scope". I only wish I had bought something like a 40mm which might have worked even better. But alll the 40mm I saw had a narrower field of view than ADORAMA"S 32mm.

Great planetary eyepiece for long refractors

By Andy B.

Nice heavy, well made eye piece. I use the 15mm on a 60mm f13 scope, as my planetary eyepiece. The Images are crisp, edge to edge. Also great for splitting doubles.

The Celestron 40mm Omni Series 1.25" Plossl Eyepiece is a testament to superior optical engineering, offering amateur astronomers and stargazing enthusiasts a high-quality, durable, and versatile accessory for their telescopic endeavors. This eyepiece is designed to elevate your celestial viewing experience with its 43-degree field of view, providing a broad and immersive panorama of the night sky.

Crafted with precision, the Omni Plossl eyepiece features a 4-element premium symmetrical design that ensures sharp, clear images of stars, planets, and other celestial bodies. The high-grade optics are further enhanced by blackened lens edges, a critical detail that significantly reduces internal reflections and boosts contrast, allowing for a more detailed observation of the cosmos.

To ensure the highest level of light transmission and contrast, each lens surface is treated with a multi-layer coating. This meticulous process results in brighter, more vivid images, making the eyepiece a user-friendly choice for both seasoned astronomers and beginners alike.

The Celestron 40mm Omni Series eyepiece also boasts a two-step anodizing process on the eyepiece barrel, which serves to eliminate distracting reflections that can detract from your viewing experience. This attention to detail sets the Omni series apart from competitors, whose eyepieces often feature reflective surfaces that can hinder observation.

Additionally, the threaded barrels of the eyepiece are compatible with 1-1/4" Celestron thread-in filters, allowing for further customization and enhancement of your viewing sessions. Whether you're scanning the heavens for distant galaxies or observing the intricate craters of the moon, the Celestron 40mm Omni Series Plossl Eyepiece is an affordable, high-quality choice that promises to enrich your astronomical adventures.

Celestron Omni Features

  • 4 Element premium symmetrical optical design
  • Fully Multi-Coated
  • 43 Degree Field of VIew
  • Blackened lens edges
  • Designer Color
  • 2-step anodize process to prevent reflection from top surfaces

Warranty Information

This product has a limited warranty of 24 months for parts and 24 months for labor.

Join VIP PRO

2 Day Delivery on thousands of items!

Sell or Trade your Gear

Get started in 3 easy steps

Key Features

  • Enjoy wide, 43-degree views with this 40mm Celestron Omni telescope eyepiece!
  • Experience comfortable observing sessions with the eyepiece's generous 31mm eye relief.
  • The 1.25" barrel diameter makes this Plossl eyepiece compatible with many telescopes.
  • Achieve optimal image clarity thanks to the high-quality lens design of this eyepiece.
  • Explore deep-sky objects or lunar details with enhanced magnification using this lens.
  • This Celestron 40mm eyepiece offers great value and performance for astronomy enthusiasts.

What's in the box:

  • Celestron Omni 40mm Eyepiece (1.25")
  • Lenscaps
  • Celestron 2 Year Warranty