Brand: Celestron

Celestron C8 SCT (OTA) Optical Tube Assembly (CGE Dovetail) (91024-XLT)

91024-XLT

Brand: Celestron

Celestron C8 SCT (OTA) Optical Tube Assembly (CGE Dovetail) (91024-XLT)

91024-XLT

The Celestron C8 is the direct (but much improved) descendent of Celestron's revolutionary C8 that transformed the hobby of astronomy when it was unveiled in 1970.
  • 8" Schmidt-Cassegrain optical tube assembly (OTA)
  • Features Celestron's premium patented StarBright XLT optical coatings
  • 2032 mm focal length (f/10)
  • Fastar compatible
  • Tube constructed of durable and lightweight aluminum
$1,835.95 CAD

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Product Description

The Celestron C8 is the direct (but much improved) descendent of Celestron's revolutionary C8 that transformed the hobby of astronomy when it was unveiled in 1970. This rugged aluminum optical tube is only 17 inches long and weighs just 13 pounds, making it easy to transport and set up. But the views are much more impressive than what you'd expect from such a compact instrument. The tube offers 2032 mm of focal length and a focal ratio of f/10, with the added versatility of Fastar (see below).

It is equipped with Celestron's patented StarBright XLT optical coatings, which visibly increase contrast and light transmission for brighter deep space images and shorter exposure times. With StarBright XLT, you'll be able to discern subtle details while viewing the Moon and planets as well as faint galaxies and nebulae.

The Celestron C8 can be mounted on a multitude of computerized telescope mounts thanks to its CGEM style dovetail bar. This iconic optical tube provides the best balance of portability, handling ease, light gathering ability and price ever offered to the amateur astronomer.

Fastar Technology

In 1997, CCDs were making a name for themselves in the astrophotography world, quickly supplanting traditional film photography thanks to their speed and convenience. This was the year that Celestron joined forces with the Santa Barbara Instruments Group (SBIG) to produce Fastar, a revolutionary add-on to Celestron's hugely popular Schmidt-Cassegrain (SCT) optical system.

With Fastar, the SCT's secondary mirror can be removed and replaced with a field-flattening lens assembly (sold separately by third party manufacturers) so that a CCD camera can be used in the front of the telescope at the f/2 focus of the instrument's primary mirror. The potential of the Fastar system is staggering: exposures are 25 times shorter than if the camera was placed at the instrument's native f/10 focus. Imagers can capture galaxies and nebulae with exposures of just 30 seconds.

StarBright XLT coatings

StarBright XLT is Celestron's revolutionary optical coating system. It consistently outperforms all other coatings in the commercial telescope market. There are three major components that make up our StarBright XLT high-transmission optical system design:

  • Unique enhanced multi-layer mirror coatings made from precise layers of aluminum, SiO2 (quartz), TiO2 (titanium dioxide), and SiO2 (silicon dioxide). Reflectivity is fairly flat across the spectrum, optimizing it for both imaging and visual observing.
  • Multi-layer anti-reflective coatings made from precise layers of MgF2 (magnesium fluoride) and HfO2 (hafnium dioxide). Hafnium-a rare element that costs nearly $2,000 per kilogram-gives us a wider band pass than the titanium used in competing coatings.
  • High-transmission water white glass is used instead of soda lime glass for the corrector lens. Water white glass transmits about 90.5% of light without anti-reflective coatings; that's 3.5% better than uncoated soda  lime glass. When water white glass is used in conjunction with StarBright XLT's anti-reflective coatings, the average transmission reaches an astonishing 97.4.

These three components make StarBright XLT one of the finest coatings available.

What can I see with a Celestron C8 SCT (OTA) Optical Tube Assembly (CGE Dovetail) (91024-XLT)?

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

Jupiter with

25mm Eyepiece - 81x Magnification

(Included with This Telescope)

Jupiter with

10mm Eyepiece - 203x Magnification

Sold Separately

Jupiter with

5mm Eyepiece - 406x Magnification

Sold Separately

Moon with 25mm Eyepiece

81x 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 25mm Eyepiece

81x Magnification

(Included with This Telescope)

Andromeda with 10mm Eyepiece

203x Magnification

Sold Separately

What's in the Box

  • 8" Schmidt-Cassegrain optical tube assembly (OTA)
  • 25mm eyepiece (81x)
  • 6x30 optical finderscope
  • Star diagonal
  • 1.25" visual back, CGEM style dovetail bar

Specifications

Optical Design: Schmidt-Cassegrain
Aperture: 203.2mm (8")
Focal Length: 2032mm (80")
Focal Ratio: f/10
Focal Length of Eyepiece 1: 25mm (0.98")
Magnification of Eyepiece 1: 81x
Finderscope: 6x30
Star Diagonal: 1.25" Star 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: 10%
Optical Coatings: StarBright XLT
Optical Tube Length: 432mm (17")
Optical Tube Diameter: 238mm (9.37")
Optical Tube Weight: 12.5 lbs (5.67 kg)
Dovetail: CGE Dovetail Bar

Customer Reviews

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D.D.
Awesome experience!

Website is clear, items are in stock, prices are right, delivery is fast, product arrived undamaged, the whole experience was perfect.
Thanks!

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