Brand: Celestron

Celestron EdgeHD 9.25" Optical Tube Assembly (OTA) (91040-XLT)

91040-XLT

Brand: Celestron

Celestron EdgeHD 9.25" Optical Tube Assembly (OTA) (91040-XLT)

91040-XLT

An aplanatic, flat field Schmidt-Cassegrain telescope that produces aberration-free images across a wide visual and photographic field of view.
  • Experience our best optical performance with EdgeHD's aplanatic, flat field Schmidt-Cassegrain optics for pinpoint stars all the way to the edge of today's largest imaging sensors and widest eyepieces
  • Aluminum optical tube with tube vents featuring an integrated 50-mesh filter allows hot air to be released from behind the primary mirror. Mirror support knobs hold the mirror in place and reduce image shift during imaging
  • Versatile design accommodates 2 focal ratios: native f/10 or ultra-fast f/2 imaging with a removable secondary mirror and third-party accessories
  • Celestron's premium StarBright XLT coatings provide maximum light transmission
  • A 9x50 finderscope, 2" mirror diagonal for more comfortable viewing, and wide-angle 23 mm Luminos 2" eyepiece are all included
10% OFF
$2,699.00 USD
Save: $300.00

Easy Payment Options with .

What is a Backorder?
10% OFF
$2,699.00 USD
Save: $300.00

Easy Payment Options with .

What is a Backorder?
Free Expert Support
Stress Free, Secure Shopping
30 Day Return Policy
Price Match Promise
Full Details What Can I See? What's in the Box? Specifications Reviews and Questions Articles, Videos, Software, Links

Product Description

EdgeHD is an aplanatic, flat field Schmidt-Cassegrain telescope that produces 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; it also provides 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 "astrographs" actually only produce pinpoint stars across a curved focal plane. While this may be acceptable for some visual observing, stars will appear out of focus at the edge when used with the 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 competing coma-free designs. This guarantees you visibly sharp stars across some of the largest CCD chips available today.

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. With Celestron's StarBright XLT optical coatings on every surface, EdgeHD optics gives you maximum light throughput across the widest visual and photographic spectrum.

Mechanical Features

In addition to EdgeHD's optimized optical design, the telescope 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 taking long exposure astro-images. Once focused, 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 on the sensor).
  • 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 50-mesh filter guaranteed to let warm air out without letting dust in.
  • Fastar versatility - EdgeHD is the most versatile imaging telescope available today. At its native f/10, you can achieve the image scale necessary to capture the smallest of deep sky objects. A Barlow gives you added power for high-resolution planetary, lunar and solar imaging. All EdgeHD optical tubes are Fastar-compatible, allowing the secondary mirror to be removed and replaced with a third party lens accessory for ultra-fast f/2 wide field imaging.

Individually Tested

Every EdgeHD that ships has been tested not only for the surface quality of each optical component, but also with a camera and artificial star to ensure the imaging system meets our rigid quality assurance. This "final acceptance test" confirms the EdgeHD will perform in the field and deliver high-quality astroimages.

What can I see with a Celestron EdgeHD 9.25" Optical Tube Assembly (OTA) (91040-XLT)?

Here are some simulated views of common objects. Results with your telescope will vary with viewing conditions, obrits, equipment and more.

Jupiter with

23mm Eyepiece - 102x Magnification

(Included with This Telescope)

Jupiter with

10mm Eyepiece - 235x Magnification

Sold Separately

Jupiter with

5mm Eyepiece - 470x Magnification

Sold Separately

Moon with 23mm Eyepiece

102x Magnification

(Included with This Telescope)

Moon with 10mm Eyepiece

235x Magnification

Sold Separately

Moon with 5mm Eyepiece

470x Magnification

Sold Separately

Andromeda with 36mm Eyepiece

65x Magnification

Sold Separately

Andromeda with 23mm Eyepiece

102x Magnification

(Included with This Telescope)

Andromeda with 10mm Eyepiece

235x Magnification

Sold Separately

What's in the Box

  • Celestron 9.25" EdgeHD Telescope OTA with StarBright XLT Coatings and Fastar Compatible Optics
  • 9x50 Finderscope
  • 23 mm Luminos Eyepiece - 2"
  • 2" Star Diagonal with 1.25" Adapter
  • CGE Mount Dovetail Rail

Specifications

OPTICAL TUBE INFO:
Optical Design: EdgeHD
Aperture: 234.95mm (9.25")
Focal Length: 2350mm (93")
Focal Ratio: f/10
Focal Length of Eyepiece 1: 23mm (0.91")
Magnification of Eyepiece 1: 102x
Finderscope: 9x50
Star Diagonal: 2" with 1.25" adapter
Optical Tube: Aluminum
Highest Useful Magnification: 555x
Lowest Useful Magnification: 34x
Limiting Stellar Magnitude: 14.4
Resolution (Rayleigh): 0.59 arc seconds
Resolution (Dawes): 0.49 arc seconds
Light Gathering Power (Compared to human eye): 1127x
Secondary Mirror Obstruction: 85mm (3.35")
Secondary Mirror Obstruction by Diameter: 36%
Secondary Mirror Obstruction by Area: 13%
Optical Coatings: StarBright XLT
Optical Tube Length: 559mm (22")
Optical Tube Diameter: 271.78mm (10.7")
Optical Tube Weight: 21lbs (9.53kg)
Dovetail: CGE Dovetail Bar
Solar Warning Never look directly at the Sun with the naked eye or with an optic (unless you have the proper solar filter). Permanent and irreversible eye damage may result.
Never use your optic to project an image of the Sun onto any surface. Internal heat build-up can damage the optic and any accessories attached to it.
Never leave your optic unsupervised. Make sure an adult who is familiar with the correct operating procedures is with your optic at all times, especially when children are present.

Customer Reviews

Based on 2 reviews
100%
(2)
0%
(0)
0%
(0)
0%
(0)
0%
(0)
C
C.B.
Quick delivery, great scope

I received the scope the day after I ordered it, thank you for the prompt delivery. I purchased the Celestron T- Adapter 48mm to achieve the required 146mm back focus with and without the .7 reducer. The Optical Tube arrived collimated and manually focuses down to 2.33 arc seconds with my ASI 6200, filter wheel and 21mm M54-48 adapter. I will install the ASI electronic focuser, OAG-L and use it with my ASI Air Pro on my AM5 mount. I've heard first hand accounts of guiding less than 1 arc second with this imaging train.

H
H.M.
Great Scope 9.25 Edge

Great telescope. Well worth the $ and the wait. The specs listed are for a 14" not the 9.25

Why Should You Trust All Star Telescope?

We've Made All The Mistakes
So You Don't Have To

Learn More