Celestron EdgeHD 8 Optical Tube Assembly (CG-5)
Product #26470
SKU 91031-XLT
In stock with supplier Usually ships in 1 - 2 weeks


Celestron EdgeHD 8 Optical Tube Assembly (CG-5)

Product #26470 | SKU 91031-XLT
In stock with supplier Usually ships in 1 - 2 weeks

8.0" Aplanatic Schmidt-Cassegrain, 2032mm, f/10, 40mm Eyepiece
Our Price $3,049.00


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The EdgeHD 8 Optical Tube Assembly from Celestron has a dovetail rail compatible with Celestron's CG-5 mount. It 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 optimise an image circle with a 42mm diameter around the centre 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 specialised astrophotography CCD cameras. Further refinement of the system's imaging capabilities is managed via mirror tension clutches that help support the primary mirror and minimise 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 23mm 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.

Key Features

Optical Performance

  • Aperture: 8.0"
  • EFL: 2032mm, f/10
  • Aplanatic Schmidt-Cassegrain system for aberration-free imaging
  • Premium StarBright XLT coatings for enhanced light transmission

Construction Details

  • Aluminium 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 CG-5 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

40mm Eyepiece

  • Provides 51x magnification with EdgeHD 8

90° Diagonal

  • Accepts 1.25" eyepieces
  • Image orientation: right-side-up, laterally reversed

Specifications

Optical Design
Aplanatic Schmidt-Cassegrain
Aperture
8.0" / 203.2mm
Focal Length
2032mm / 80.0"
Focal Ratio
f/10
Resolving Power
Rayleigh: 0.68 arc/sec
Dawes: 0.57 arc/sec
Theoretical Minimum and Maximum Magnification
Min: 29x
Max: 480x
Dovetail Plate
Included, compatible with CG-5 mount
Visual Back
Included
Eyepiece Barrel Diameter
1.25" diagonal
Finderscope
9x50
Optical Tube Dimensions
Length: 17.0" / 43.2 cm
Weight
14 lb / 6.4 kg

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Product:
Celestron EdgeHD 8 Optical Tube Assembly (CG-5)
Manufacturer:
Celestron
Model:
91031-XLT
SKU:
91031-XLT
RM Product #:
26470