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GSO 8" Ritchey-Chretien Astrograph Telescope Carbon

GSO 8" Ritchey-Chretien Astrograph Telescope Carbon

Regular price $2,299.00
Regular price Sale price $2,299.00
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Affordable, portable RC Astrograph telescope with outstanding optical quality and a carbon fibre tube. Ideal for astrophotography.

Ritchey-Chretiens deliver images with very little distortion. They have a flat field of view, so objects are in sharp focus right to the edge of the image. The image is coma-free, so stars at the edge of the field of view remain perfectly round. And there is no false colour because they use only mirrors with no correcting lens. 

The 8" f/8 design provides enough aperture and a long enough focal length to give good image scale. It is ideal for smaller deep sky objects such as planetary nebulae, galaxies and small globular clusters. 

The carbon fibre tube has very high strength and rigidity, ideal for long exposure photography. 

GSO mirrors are made from optical quality quartz glass and are limited only by diffraction, which means they achieve the theoretical maximum resolution possible for the size of the mirror. They are machined and polished to better than 1/12 wavelength, sometimes 1/16 wavelength, which is considerably better than the industry norm. Each mirror is individually tested and hand-corrected if necessary after production, with final testing by laser interferometry.  

The open tube and quartz mirror enables the telescope to cool quickly, with virtually no problems with dew. A computer-optimised baffle system minimises any stray light in the tube. 

Optical tube assembly only. Comes with a 2" Linear Bearing Crayford focuser, a Vixen dovetail bar, a Losmandy dovetail bar, two 25mm extension tubes and one 50mm extension tube. An optional collimation ring is available

What's in the box:
  • 8" (203 mm) f/8 Ritchey-Chretien carbon fibre optical tube assembly

  • 2" Crayford Linear Bearing 10:1 micro edge focuser

  • one each Vixen (top) and Losmandy (bottom) dovetail bars

  • Two 25mm and one 50mm RC extension tubes 

Product specs:


Optical design Ritchey-Chretien
Primary mirror 8" (203 mm) quartz with surface quality better than 1/12 wave RMS
Focal length 1624 mm  
Focal ratio f/8 
Resolution 0.57 arc seconds
Focuser  Crayford 2" Linear Bearing 10:1 micro edge 
Back focus 254mm From rear cell, 159mm with focuser installed
Tube length 580 mm 
Tube material Carbon fibre
Weight of tube 7 kg 
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