Brand: Celestron

Celestron EdgeHD 8" Optical Tube Assembly (OTA) (91030-XLT)

91030-XLT

Brand: Celestron

Celestron EdgeHD 8" Optical Tube Assembly (OTA) (91030-XLT)

91030-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 3 focal ratios: native f/10, f/7 with the addition of a focal reducer, 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, 1.25" mirror diagonal for more comfortable viewing, and 40 mm Plossl 1.25" eyepiece are all included.

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$1,399.00 USD
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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. Add the optional reducer lens-custom-designed for your size EdgeHD tube-and you can increase your field of view without sacrificing optical performance. 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 8" Optical Tube Assembly (OTA) (91030-XLT)?

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

Jupiter with

40mm Eyepiece - 51x Magnification

(Included with This Telescope)

Jupiter with

10mm Eyepiece - 203x Magnification

Sold Separately

Jupiter with

5mm Eyepiece - 406x Magnification

Sold Separately

Moon with 40mm Eyepiece

51x Magnification

(Included with This Telescope)

Moon with 10mm Eyepiece

203x Magnification

Sold Separately

Moon with 5mm Eyepiece

406x Magnification

Sold Separately

Andromeda with 36mm Eyepiece

56x Magnification

Sold Separately

Andromeda with 40mm Eyepiece

51x Magnification

(Included with This Telescope)

Andromeda with 10mm Eyepiece

203x Magnification

Sold Separately

What's in the Box

  • Celestron 8" EdgeHD Telescope OTA with StarBright XLT Coatings and Fastar Compatible Optics
  • 9x50 Finderscope
  • 40mm Plossl
  • 1.25" Star Diagonal with 1.25" Adapter
  • CGE Mount Dovetail Rail

Specifications

OPTICAL TUBE INFO:
Optical Design: EdgeHD
Aperture: 203.2mm (8")
Focal Length: 2032mm (80")
Focal Ratio: f/10
Focal Length of Eyepiece 1: 40mm (1.57")
Magnification of Eyepiece 1: 51x
Finderscope: 9x50
Star Diagonal: 1.25" Stay Diagonal
Optical Tube: Aluminum
Highest Useful Magnification: 480x
Lowest Useful Magnification: 29x
Limiting Stellar Magnitude: 14
Resolution (Rayleigh): 0.69 arc seconds
Resolution (Dawes): 0.57 arc seconds
Light Gathering Power (Compared to human eye): 843x
Secondary Mirror Obstruction: 64mm (2.5")
Secondary Mirror Obstruction by Diameter: 31%
Secondary Mirror Obstruction by Area: 9.77%
Optical Coatings: StarBright XLT
Optical Tube Length: 432mm (17")
Optical Tube Diameter: 238mm (9.37")
Optical Tube Weight: 14 lbs (6.35 kg)
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 3 reviews
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T
T.A.
Great.However

Rear cell adapter was near impossible to unscrew. Had to get some intstruction to remove it. FED EX messed up my shipping also.

G
G.
A great long focal length telescope in a compact package!

My Celestron EdgeHD 8" OTA is a great addition to my arsenal since it has a long native focal length of 2032mm (f/10), and even with the 0.7x reducer its focal length is still long at 1422 (f/7). The only caveat is that if you prefer the relative simplicity of a refractor, this scope will be quite different might be a little too much work for you to get up and running and maintained. I will say, though, that collimation of this scope is very easy -- in fact, easier than collimating a Newt since there is only the secondary mirror that factors into collimation. For planetary/galaxy astrophotography, having a longer focal length at a relatively affordable price, is really a must for me. I'm very happy with my purchase, and All-Star Telescope has been fantastic with their customer service!

C
C.S.
Amazing!

Finally pulled the trigger on an Edge HD 8” OTA. This thing is beautiful. Thanks to All Star Telescope for hooking me up.

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