Details
Additional Information
| Optical Design | Schmidt-Cassegrain |
|---|---|
| Aperture (mm) | 127 mm (5 in) |
| Focal Length (mm) | 1250 mm (49 in) |
| Focal Ratio | 9.84 |
| Eyepiece 1 (mm) | 25 mm (0.98 in) |
| Magnification 1 | 50 x |
| Finderscope | 6x30 |
| Mount | Omni CG-4 Equatorial |
| Tripod Legs | 1.75" Stainless |
| Weight (lbs) | 40 lbs (18 kg) |
| Highest Useful Magnification | 300 x |
| Lowest Useful Magnification | 18 x |
| Limiting Stellar Magnitude | 13 |
| Resolution (Rayleigh) | 1.1 arc seconds |
| Resolution (Dawes) | 0.91 arc seconds |
| Light Gathering Power (Compared to human eye) | 329 x |
| Angular Field of View (deg) | 1 ° |
| Linear Field of View (@1000 yds) | 53 ft (16 m) |
| Optical Coatings | StarBright XLT |
| Optical Tube Length | 11 in (279 mm) |
| Optical Tube Weight | 6.5 lbs (2.95 kg) |
| EQ Mount Weight | 21 lbs (9.53 kg) |
| Tripod Weight | 12.5 lbs (5.67 kg) |
| Counterweights | 7 lbs (3.2 kg) and 4 lbs (1.8 kg) |
Related Products
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Instructional Videos
Knowledge Base
- What size of scope is best for different kinds of objects?
- Aperture
- Focal length
- Contrast
- Light gathering power and magnitude limit
- Telescope-Astronomy Resources on the Web
- What does magnitude mean?
- Exit pupil
- What are diffraction-limited optics?
- What is the focal ratio? How is it related to the f-stop?
- Near focus
- Field of view
- Magnification or power
- Resolution - resolving power
- Optical design aberrations
- How do I align the SCT's corrector plate and secondary?
- Why don't the images I see through my telescope look the same as photos I see taken with the same type of telescope?
- How far can I see with a telescope?
- How do you determine a telescope's magnification?
- Rough polar alignment
- Why do I need polar alignment?
- Accurate polar alignment
- Precise polar alignment
- Polar alignment for the southern hemisphere
- I'm using a focal reducer and can't seem to focus my SLR camera on my Schmidt-Cassegrain telescope (SCT). What am I doing wrong?
- What is vignetting?
- I'm doing photography with an eyepiece, using my camera with and without a lens. What are the f-numbers of my setup for the afocal and eyepiece projection methods?
- Which screws are safe to remove for mounting an accessory finderscope on my Celestron Schmidt-Cassegrain telescope (SCT)?
- What are the pros and cons of adding aftermarket collimating screws to my Schmidt-Cassegrain telescope (SCT)?
- Can my NexStar hand control be repaired instead of replaced?
- What is back focus? What problems does it cause for visual and photographic use of my scope? What are related focus issues?
- I need to box up my scope and ship it. What's the best way to pack it?
- Why won't my image erecting eyepiece or image erecting diagonal always give right side up images with my scope?
- My image shifts when I'm focusing my Schmidt-Cassegrain telescope (SCT) and after I get a great focus, the focus will change. What is happening?
- What is field rotation? How does it affect my scope's viewing and imaging?
- Why do I need to guide my telescope for photography? Don't accurate alignment and firmware functions like periodic error correction (PEC) take care of it all?
- What is a star party? Where do I find information on star parties in and around my area?
- I "accidentally" took apart my eyepiece, removing the lens that goes closest to my eye. Help! How do I put it back together?
- I'm looking at my Celestron scope and it has a serial number on it. Can you tell me the model, type and year it was made?
- I want to use the focal reducer/corrector with an aftermarket eyepiece holder. What is the best spacing, focal length, etc?
- How do I use the setting circles on my Celestron German equatorial mount?
- How do I use the RA vernier scales on my Omni XLT (CG-4) mount's setting circles?
- I just got my Celestron telescope with a 6x30 finder. How do I focus the finderscope?
- How much will the addition of a focal reducer increase my scope's field of view?
- How do I collimate my Omni 127 Schmidt-Cassegrain telescope (SCT)?
- How do I remove the optics from the optical tube assembly (OTA) of my Schmidt-Cassegrain telescope (SCT)?
- How do I remove the optics from the optical tube assembly (OTA) of my Schmidt-Cassegrain telescope (SCT)?
- The standard visual back on my Schmidt-Cassegrain telescope (SCT) has threads on the outside of the barrel. What are these threads for?
- Everything is upside down in my telescope.
Downloads
Manuals
Omni XLT Manual (9.2 MB | PDF)
Reference Materials
- Astronomy Basics (English, French, German, Italian, Spanish) (2.26 MB | PDF)
- Telescope Basics (English, French, German, Italian, Spanish) (481.61 KB | PDF)
- Telescope Maintenance (English, French, German, Italian, Spanish) (640.68 KB | PDF)
- Celestial Observing (English, French, German, Italian, Spanish) (381.85 KB | PDF)
CELESTRON TWO YEAR LIMITED WARRANTY
A. Celestron warrants your telescope to be free from defects in materials and workmanship for two years. Celestron will repair or replace such product or part thereof which, upon inspection by Celestron, is found to be defective in materials or workmanship. As a condition to the obligation of Celestron to repair or replace such product, the product must be returned to Celestron together with proof-of-purchase satisfactory to Celestron.
B. The Proper Return Authorization Number must be obtained from Celestron in advance of return. Call Celestron at (310) 328-9560 to receive the number to be displayed on the outside of your shipping container.
All returns must be accompanied by a written statement setting forth the name, address, and daytime telephone number of the owner, together with a brief description of any claimed defects. Parts or product for which replacement is made shall become the property of Celestron.
The customer shall be responsible for all costs of transportation and insurance, both to and from the factory of Celestron, and shall be required to prepay such costs.
Celestron shall use reasonable efforts to repair or replace any telescope covered by this warranty within thirty days of receipt. In the event repair or replacement shall require more than thirty days, Celestron shall notify the customer accordingly. Celestron reserves the right to replace any product which has been discontinued from its product line with a new product of comparable value and function.
This warranty shall be void and of no force of effect in the event a covered product has been modified in design or function, or subjected to abuse, misuse, mishandling or unauthorized repair. Further, product malfunction or deterioration due to normal wear is not covered by this warranty.
CELESTRON DISCLAIMS ANY WARRANTIES, EXPRESS OR IMPLIED, WHETHER OF MERCHANTABILITY OF FITNESS FOR A PARTICULAR USE, EXCEPT AS EXPRESSLY SET FORTH HEREIN. THE SOLE OBLIGATION OF CELESTRON UNDER THIS LIMITED WARRANTY SHALL BE TO REPAIR OR REPLACE THE COVERED PRODUCT, IN ACCORDANCE WITH THE TERMS SET FORTH HEREIN. CELESTRON EXPRESSLY DISCLAIMS ANY LOST PROFITS, GENERAL, SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES WHICH MAY RESULT FROM BREACH OF ANY WARRANTY, OR ARISING OUT OF THE USE OR INABILITY TO USE ANY CELESTRON PRODUCT. ANY WARRANTIES WHICH ARE IMPLIED AND WHICH CANNOT BE DISCLAIMED SHALL BE LIMITED IN DURATION TO A TERM OF TWO YEARS FROM THE DATE OF ORIGINAL RETAIL PURCHASE.
Some states do not allow the exclusion or limitation of incidental or consequential damages or limitation on how long an implied warranty lasts, so the above limitations and exclusions may not apply to you.
This warranty gives you specific legal rights, and you may also have other rights which vary from state to state.
Celestron reserves the right to modify or discontinue, without prior notice to you, any model or style telescope.
If warranty problems arise, or if you need assistance in using your telescope contact:
Celestron
Customer Service Department
2835 Columbia Street
Torrance, CA 90503
Tel. (310) 328-9560
Fax. (310) 212-5835
Monday-Friday 8AM-4PM PST
NOTE: This warranty is valid to U.S.A. and Canadian customers who have purchased this product from an authorized Celestron dealer in the U.S.A. or Canada. Warranty outside the U.S.A. and Canada is valid only to customers who purchased from a Celestron's International Distributor or Authorized Celestron Dealer in the specific country. Please contact them for any warranty service.
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For a complete list of Celestron dealers, please visit our Dealer Locater
