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Celestron EdgeHD 8 Optical Tube Assembly
Celestron EdgeHD 8 Optical Tube Assembly

Celestron EdgeHD 8 Optical Tube Assembly

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Your Price: CAD $1,630.44
Retail Price:CAD $1,669.00

Your Savings:CAD $38.56(2%)

Generally Ships in 5-7 Business Days
Part Number:91030-XLT

Choose Options or Accessories if Applicable

Imaging Cameras/Autoguider
Camera Adapters and Imaging Accessories
1.25" Observers Accessory Kit
Barlow Lenses
Eyepiece and Filter Kits
Filters

Key Technologies

StarBright XLT, All-Star Polar Alignment, EdgeHD Optics, SCHOTT Glass

Quick Overview

  • 8" EdgeHD Optical Tube Assembly
  • Aluminum Optical Tube
  • Celestron's premium StarBright XLT coatings
  • 2032 mm focal length (f/10)
  • 40 mm eyepiece included (51x)
  • Visual back allows for use with 1.25" accessories
  • 9x50 finderscope to help accurately find objects
  • Star 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

The EdgeHD 8 Optical Tube Assembly from Celestron features an Aplanatic Schmidt-Cassegrain optical system. This compound, or catadioptric, light-path employs a combination of mirrors and lenses that offer a large high-resolution aperture, a shorter tube length, and enhanced portability. This telescope has an 8.0" aperture, a focal length of 2032mm, and a focal ratio of f/10.

The EdgeHD optical system consists of a zero power corrector plate, a spherical primary mirror, and a secondary mirror along with a set of field flattening lenses integrated into the baffle tube. The optics of an EdgeHD telescopes feature StarBright XLT multi-layer coatings on the primary and secondary mirrors for increased reflectivity. The corrector is also fully coated to ensure enhanced anti-reflection characteristics.

The EdgeHD optical system is designed to optimize an image circle with a 42 mm diameter around the center of the field of view. This circle completely covers the diagonal of a full-frame DSLR camera or a standard 35mm film frame. As such, it extends significantly beyond the diagonal of APS-C sensors and the smaller chips used in specialized astrophotography CCD cameras. Further refinement of the system's imaging capabilities is managed via mirror tension clutches that help support the primary mirror and minimize its lateral movement. This enhancement is particularly important to astrophotographers as it significantly improves the system's stability and imaging clarity.

This OTA comes with a very useful 9x50 finderscope fitted to its exterior. Due to its wider field of view, this ancillary optic can offer assistance in locating objects to view with the main scope.

Normal image orientation for the EdgeHD design is upside-down and reversed. The 1.25" diagonal inverts this image so it is right-side-up, but reversed. This diagonal directly accepts 1.25" eyepieces.

Also included in this package is Celestron's Axiom LX 23 mm wide angle eyepiece. This ocular is ideal for deep-space viewing - its wide field of view produces a feeling of being surrounded by the viewing experience.

 

Optical Performance
  • Aperture: 8.0"
  • EFL: 2032 mm, f/10
  • Aplanatic Schmidt-Cassegrain system for aberration-free imaging
  • Premium StarBright XLT coatings for enhanced light transmission
Construction Details
  • Aluminum tube
  • Visual back accepts 1.25" accessories
  • Mirror support knobs reduce image shift
  • Filtered tube vents release hot air from behind the primary mirror
  • Dovetail rail: included in package - compatible with Celestron's CGE mount
  • Fastar compatible: equipped with a removable secondary mirror for ccd imaging
9x50 finderscope
  • Angle of view: 5.8°
  • Assists in locating objects
  • All mounting hardware is included in kit
40 mm Eyepiece
  • Provides 51x magnification with EdgeHD 8
90° Diagonal
  • Accepts 1.25" eyepieces
  • Image orientation: right-side-up, laterally reversed

Optical Design Schmidt-Cassegrain
Aperture (mm) 355.6 mm (14 in)
Focal Length (mm) 3910 mm (154 in)
Focal Ratio 11
Eyepiece 1 (mm) 40 mm (1.57 in)
Magnification 1 98 x
Finderscope 9x50
Star Diagonal 1.25
Optical Tube Aluminum
Fastar Compatible Yes
Highest Useful Magnification 840 x
Lowest Useful Magnification 51 x
Limiting Stellar Magnitude 15.3
Resolution (Rayleigh) 0.39 arc seconds
Resolution (Dawes) 0.33 arc seconds
Light Gathering Power (Compared to human eye) 2581 x
Secondary Mirror Obstruction 4.5 in (114 mm)
Secondary Mirror Obstruction by Diameter 32 %
Secondary Mirror Obstruction by Area 10 %
Optical Coatings StarBright XLT
Optical Tube Length 31 in (787 mm)
Optical Tube Weight 45 lbs (20 kg)
Dovetail Compatibility CGE Mount

 
What's in the Box:
Celestron EdgeHD 8 Optical Tube Assembly
  • 40 mm eyepiece
  • 9x50 Finderscope
  • 1.25" 90° Diagonal
  • Limited 2 Year Warranty
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