2-year Telescope Warranty

EdgeHD 11 Optical Tube Assembly

Item # 91050-XLT

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Quick Overview

  • 11" EdgeHD Optical Tube Assembly
  • Aluminum Optical Tube
  • Celestron's premium StarBright XLT coatings
  • 2800mm focal length (f/10)
  • 23mm Axiom 2" eyepiece included (102x)
  • 9x50 finderscope to help accurately find objects
  • 2" diagonal provides more comfortable viewing position when observing objects that are high in the sky
  • Mirror Support Knobs hold the mirror in place and reduces image shift during imaging.
  • Tube vents with integrated 60 micron mesh filter allowing hot air to be released from behind the primary mirror.
  • Fastar Compatible optical tubes are equipped with a removable secondary mirror for fast f/2 ccd imaging
  • Includes dovetail rail compatible with CGE mount

EdgeHD 11 Optical Tube Assembly

Multimedia Gallery

Awards

Hot Product 2010

Key Technologies

All-Star Polar Alignment
EdgeHD Optics
SCHOTT Glass
StarBright XLT

Details

NOTE: This product is currently shipping, however, due to overwhelming demand, we are accepting preorders for May 2010 fulfillment. 

SEE THE UNIVERSE IN HD

Introducing Celestron's New Aplanatic Schmidt Telescope Design!

  • Visibly Sharper Images
  • Superior Performance
  • Enhanced Mechanical Features
  • Fastar® Compatible

EdgeHD is an aplanatic Schmidt telescope designed to produce aberration-free images across a wide visual and photographic field of view. The optical system was designed to reduce more than just off-axis star coma, but also to give an astrograph quality flat focal plane all the way to the edge of the field of view.

True Astrograph Quality
Many optical designs that advertise themselves as "astrograph" quality actually only produce pinpoint stars across a curved focal plane. While this may be acceptable for visual observing, stars will appear out of focus at the edge when used with a flat chip sensor of a digital camera. EdgeHD optics produce a focal plane more than three-times flatter than a standard Schmidt Cassegrain telescope and dramatically flatter than other competing coma-free designs. This guarantees you visibly sharp stars across some of the largest CCD chips available today.

EdgeHD Optics

Improved Performance
Superior edge performance not only creates rounder, more pleasing stars but actually improves the resolution and limiting magnitude when compared to telescopes of equal aperture. Starbright XLT® Coatings coupled with Celestron's StarBright XLT coating group on every surface, EdgeHD optics gives you maximum light throughput across the widest visual and photographic spectrum.

Mechanical Features
In addition to Celestron’s new optimized optical design, the EdgeHD tube has been redesigned to make sure you get the most from your optics each and every night.

Mirror Clutches - Flexible tension clutches hold the mirror in place and reduce image shift when rotating the tube around the mount. The flexible rods allow the mirror to be held in place without putting any force or pressure on the mirror assembly, keeping the image centered in the eyepiece (or chip).

Tube Vents - Cooling vents located on the rear cell allow hot air to be released from behind the primary mirror. Each vent has an integrated 60 micron micro-mesh filter guaranteed to let warm air out without letting dust in.

Fastar Versatility - The EdgeHD is the most versatile imaging scope available today. At its native f/10 you can achieve the image scale necessary to capture the smallest of deep sky objects. With the optional reducer lens (coming soon) you can increase your field of view without sacrificing optical performance. A barlow gives you the added power for high resolution planetary, lunar and solar imaging. And of course all EdgeHD optical tubes are Fastar® compatible for ultra fast f/2 wide field imaging. Each tube has been fitted with a removable secondary mirror and are opto-mechanically aligned on a laser bench to ensure they are axially symmetric in any configuration.

Additional Information

Optical Design EdgeHD
Aperture (mm) 279.4 mm (11 in)
Focal Length (mm) 2800 mm (110 in)
Focal Ratio 10
Eyepiece 1 (mm) 23 mm (0.91 in)
Magnification 1 122 x
Finderscope 9x50
Star Diagonal 2" w/ 1.25" adapter
Optical Tube Aluminum
Highest Useful Magnification 660 x
Lowest Useful Magnification 40 x
Limiting Stellar Magnitude 14.7
Resolution (Rayleigh) 0.5 arc seconds
Resolution (Dawes) 0.42 arc seconds
Light Gathering Power (Compared to human eye) 1593 x
Secondary Mirror Obstruction 3.75 in (95 mm)
Secondary Mirror Obstruction by Diameter 34 %
Secondary Mirror Obstruction by Area 12 %
Optical Coatings StarBright XLT
Optical Tube Length 24 in (610 mm)
Optical Tube Weight 28 lbs (13 kg)
Dovetail Compatibility CGE Mount

News

Knowledge Base

  1. Will I be able to use my standard Celestron f/6.3 reducer/corrector with an EdgeHD?
  2. Will I be able to use my standard Celestron SCT T-adapter 93633-A to attach my SLR camera to the EdgeHD?
  3. How do my EdgeHD mirror support knob flexible tension clutches work? Will they interfere with focusing my scope?
  4. What is the optimized image circle for the EdgeHD optical tube assembly (OTA)?
  5. I want to use a binoviewer with my EdgeHD optical tube (OTA). What is its back focus distance?
  6. My Schmidt-Cassegrain cooling fan needs an open baffle tube to work. .How can I cool my EdgeHD optical tube (OTA) since there is now a lens assembly in the baffle tube?
  7. How do I collimate the EdgeHD?
  8. My images with a CCD camera are showing black or white streaks on the brighter stars. They are all bloomed out. What's wrong with my scope?
  9. What is the operating temperature range for Celestron's telescopes?
  10. What are Fastar and HyperStar? How do they work?
  11. What is the timetable for shipments on the EdgeHD? What about accessories like the focal reducer?
  12. My EdgeHD optical tube assembly (OTA) has four small tapped holes along the front rim. What are they for?
  13. I want to photograph wildlife and terrestrial scenes with a telescope that can deliver high resolution. Is the EdgeHD a good choice for this application?
  14. How do I mount my finderscope bracket on the EdgeHD 800/925/1100/1400 optical tube assembly (OTA)?
  15. Is the Deluxe Tele-Extender #93643 compatible with my EdgeHD?
  16. I have a small-chip CCD camera-APC-format DSLR-webcam with an adapter that isn't made for the EdgeHD. What problems will I have with image quality using this system since it's not the optimum spacing?
  17. What is the size of the threading holding the visual back to my Schmidt-Cassegrain telescope? Is it the same for all Celestron SCTs?
  18. What's the length of the EdgeHD T-Adapter #93646?
  19. Is there vignetting with the EdgeHD optics and reducers on a full-frame image sensor?
  20. C11 Edge HD Back Focus
2-year Telescope Warranty

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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