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Celestron Omni XLT 120 Telescope

SKU : CE-21090

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  • 120 mm (4.75-inch) Refractor Telescope.
  • CG-4 Equatorial Mount.
  • 1.25-inch Focuser, Star Diagonal, and 25 mm Eyepiece.
  • Slow-Motion Controls for easy Tracking.
  • StarBright XLT Optical Coatings.


Product Details

  • This Celestron Omni XLT 120 Refractor combines a solid German Equatorial Mount with an optical system featuring a hand-selected, Starbright XLT multicoated lens at a price that’s surprisingly low for a scope of this aperture. With superior optics and a stable platform, this refractor is a great choice for Astrophotography.


    • StarBright XLT Coating- 16% improvement over previous coating technology and provides maximized light transmission.
    • German Equatorial Mount-sports setting circles and slow-motion controls to accurately locate and track sky objects.
    • Heavy-Duty pre-assembled Tripod-stainless steel tripod features 1.75-inch legs, and a bubble level for an easy, “no-tool” set-up.


      • Optical Design: Refractor.
      • Focal Length: 1000 mm (39 inches).
      • Focal Ratio: 8.33.
      • Focal Length of Eyepiece 1: 25 mm (0.98 inches).
      • Magnification of Eyepiece 1: 40x.
      • Finderscope: 6x30.
      • Continued Below.


      • Mount Type: Omni CG-4 Equatorial.
      • Tripod Leg Diameter: 1.75-inch Stainless.
      • Highest Useful Magnification: 283x.
      • Lowest Useful Magnification: 17x.
      • Limiting Stellar Magnitude: 12.9.
      • Resolution (Rayleigh): 1.16 arc seconds.
      • Resolution (Dawes): 0.97 arc seconds.
      • Light Gathering Power (Compared to human eye): 294x.
      • Apparent Field of View: 1.25 degrees.
      • Linear Field of View (@1000 yds): 66 ft (20 m).
      • Optical Coatings: StarBright XLT.
      • Optical Tube Length: 1016 mm (40 inches).
      • Optical Tube Weight: 12.5 lb (5.67 kg).
      • Tripod Weight: 12.5 lb (5.67 kg).
      • Weight of Counterweights: 7 lb (3.2 kg) and 4 lb (1.8 kg).
      • Software: Starry Night Special Edition.
      • Continued Below.

      Celestron Product Number: 21090

    • specifications

      Alignment ProcedureManual Alignment
      Aperture120 mm (4.75")
      CD ROMs IncludedThe Sky Level 1
      Counterweights(1) 7 lbs. and (1) 4 lbs.
      Dew Shield IncludedYes
      Focal Length1000 mm
      Focal Ratiof/8.3
      Free ShippingYes
      Head DesignEquatorial
      Mount Weight21 lbs.
      Optical DesignDoublet Refractor
      OTA Length40"
      OTA Mount TypeCG 4/ Dovetail Bar
      OTA Weight12.5 lbs.
      Warranty2 Year Warranty
    • included items

      • Omni XLT 120 Refractor OTA.
      • CG-4 Equatorial Mount.
      • Omni XLT Tripod, with 1.75-inch Adjustable Steel Legs.
      • Accessory Tray/ Spreader.
      • 1.25-inch Rack-and-Pinion Focuser.
      • 1.25-inch Star Diagonal.
      • 1.25-inch Eyepiece/ 25 mm, 50-degree FOV, 20 mm Eye Relief.
      • The Sky-Level 1 Software on CD ROM.
      • Dew Shield.
      • 2 Year Celestron Warranty.


    Product Reviews

    Customer Reviews
    5.0 Based on 7 Reviews
    5 ★
    4 ★
    3 ★
    2 ★
    1 ★
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    Filter Reviews:

      First Telescope

      I dont have much to compare this scope to as its my first, but it provides splendid views of everything in the sky.


      Omni XLT 120

      Great scope with excellant optics and mount. Only negative comment is that the finder scope is poor, a finder with a right-angle eyepiece would be kinder to the neck and back when viewing objects higher in the sky than 45 degrees!

      J.P. Oravec

      Omni XLT 120 Refractor

      I recieved the scope less than 48 hrs. after I ordered it. After testing it for several nights I find that the scope works perfectly. It surpasses my best expectations. Yes I would recommend buying one to anyone intrested. User level would be anywhere from beginers to intermediate level. I am very glad that I chose this scope.


      My first telescope

      I have had this scope for 21 months. It's my first and only telescope so far. I purchased this scope for the price, xlt coatings, not needing to collimate a refractor, and the other positive reviews. Using a telescope on an EQ mount has been a learning experience. There is much to learn including balancing the telescope, placement of the scope and weights on the mount, and polar aligning for tracking of planets. Without tracking, a planet will only stay in the viewfinder for a few seconds. Setting up takes about 20 minutes, and a bit of strength and dexterity is needed for set-up, polar alignment, and finding objects in the finder, especially when objects are high in the sky and the finder is therefore only a couple of feet off the ground. To date I have purchased and learned to use the following accessories in order to fully realize the viewing, tracking and astrophotography capabilities of this scope: OPT 2 Deluxe Dialectric Mirror diagonal, WO binoviewer and a second Celestron 25mm Omni 1-1/4 plossl, Televue 2x and 3x long 1-1/4 barlows, Celestron Polar finder for CG4, Orion EQ-3M single axis drive, Orion Accu Focus electronic focuser, and an Imaging Source DFK21AU04.AS USB Astronomy Camera with IR-cut filter, as well as a large foam padded hard case to hold all the accessories. I also made my own vibration pads out of sorbothane and furniture leg cups. The above accessories cost twice what the original scope and mount did, but I have a scope and mount that performs extremely well, allows me to view and photograph the moon and planets,and experience astronomy and astrophotography to my heart's content (the skies and weather allowing.I got into astrophotography after realizing that at 160x, the planets appear to be only about 1/4 inch in diameter in the telescope's eyepiece. I'm very pleased with OPT and with this scope, mount and all of the accessories listed above.


      My second and best telescope yet

      I've been thinking of buying this telescope for about a week, reading reviews where ever I can find them. Seeing some good reviews, the urge to buy it was too much. Yeah it took a week to come in 2nd Day Air but it was worth waiting for. I didn't expect the two boxes it came in to be so big. Both boxes showed signs of wear but the bubble wrap and the packing foam held. When I first took out the telescope from the box, I was stunned by the size of the telescope. It was a little bigger than I had expected it to be but it doesn't bother me. Set up was easy to understand in the manual, but there were a few typos I believe. No bother there but it needs to be corrected. The mount is nice and sturdy, that's a plus for me. It took me a while to understand the equatorial mount since this is my first move from Alt-Azimuth mount. The only reason I knocked off 1/2 a star is because of the DEC clamp didn't function for me. By trying to tighten the DEC clamp with no tightening of the DEC axis led to the breakage of the bolt clamp :( I think that Celestron overlook this little detail and now I have to wait until a new bolt clamp comes in. Other than that little issue for me, this is a great telescope. Optics are super for this price. Thanks Celestron for making such an awesome refractor!


      Omni XLT 120

      Recently I ordered a Celestron Omni XLT 120 refractor telescope and the optional eyepiece set. I received it one week after my internet order. Optcorp must have loaded the scope on a truck as soon as I pressed the send button! Optcorp gets 5 stars. Thanks Optcorp. My order arrived in three large boxes and the packaging was very sturdy. All the parts were there and labeled well. Everything fit together easily with almost no need to resort to instructions. The Omni XLT is larger than I had expected. I mean, I knew the exact dimensions from my research into which scope would best serve my needs and budget. I even laid it out with a tape measure on my table to get an idea of size. But, you just don't realize how big it is until it's in your hands. The size is one of my problems with this scope. The mount, being manually operated, puts the comtrols almost out of reach while looking through the eyepiece, even with the optical tube adjusted as far forward as possible on the mount. I can't take points off for that though, just FYI. What I did take the 1/2 point off for was the size and/or placement of the control knobs. When the mount is rotated the knobs can hit each other. With some alignments I have them against each other so tight that one cannot turn without the other turning. Then I have to stop observing in order to move one knob to the opposite side of the mount. To solve this problem? Slightly smaller knobs. Other than that, the Omni XLT 120 is great telescope buy. This scope has very good optics and is well made in fit and finish. The tripod and mount is heavy and sturdy. The optional eyepiece set is a very useful addition with the bonus of a great looking aluminum case to keep them safe. Soon, my Omni will get a dual axis drive to make it even better. Clear skies!