Celestron EdgeHD 800 XLT Optical Tube Assembly OTA 91030-XLT

Description

Celestron EdgeHD 8" SCT (CGE) Optical Tube Assembly
Used
SKU: 91030-XLT_FCVG
Features
8" aperture with a focal length of 2032 mm
Aberration-free images across a wide visual
Astrograph-quality flat focal plane
Visibly sharp stars across large CCD chips
Improves the resolution and limiting magnitude
StarBright XLT optical coatings on every surface
Flexible tension clutches hold mirror and reduce image shift
Cooling vents release hot air from behind the primary mirror
Versatile imaging telescope available today​
Product Description
The night sky has always fascinated individuals and with good reason. The heavens are teeming with life, but sadly, most of it is not visible to the naked eye. Now with the study of Astronomy and the invention of telescopes, the moon, stars and planets are all within reach. With the right instruments, there's no telling what you might see.
See the Universe in HD
The Celestron EdgeHD 8" SCT Optical Tube Assembly 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. The EdgeHD OTA has an 8" aperture with a focal length of 2032 mm. It comes with a 40 mm Plössl 1.25” eyepiece, a 9x50 finderscope, and a 1.25” mirror diagonal for more comfortable viewing.
True 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, tube vents and Fastar versatility are just three examples of EdgeHD's newest features.
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).
Cooling vents located on the rear cell allow hot air to be released from behind the primary mirror. Each vent has an integrated 95-micron micromesh filter guaranteed to let warm air out without letting dust in.
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 Celestron's rigid quality assurance. This “final acceptance test” confirms the EdgeHD will perform in the field and deliver high-quality astroimages.
What's in the Box
Celestron EdgeHD 8" SCT Optical Tube Assembly
8" EdgeHD Optical Tube Assembly
9x50 Finderscope
1.25” Mirror Diagonal
40 mm Plössl 1.25” Eyepiece
CGE Dovetail Rail
Specifications
Optical Design: EdgeHD
Aperture (mm): 203.2 mm (8")
Focal Length: 2032 mm (80")
Focal Ratio: 10
Focal Length of Eyepiece 1 (mm): 40 mm (1.57")
Magnification of Eyepiece 1: 51x
Finderscope: 9x50
Star Diagonal: 1.25
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: 69 mm (2.7")
Secondary Mirror Obstruction by Diameter: 34%
Secondary Mirror Obstruction by Area: 11%
Optical Coatings: StarBright XLT
Optical Tube Length: 432 mm (17")
Optical Tube Weight: 14 lbs (6.35 kg)
Dovetail Compatibility: CGE Mount
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