RC : Ritchey-Chretien
Astrographic Telescopes by GSO
  Rs. 70,500
  Rs. 93,000
  Rs. 36,300
  Rs. 60,600
  Rs. 1,56,000
  Rs. 246000
  Rs. 237000
  Rs. 300000
  Rs. 408000
  Rs. 606000

Special features of the newest RC-6" to RC-16" Astrographs...

  • Ideal for astrophotography - due to virtually coma-free imaging!
  • True Ritchey-Chretien Cassegrain-type optics produce super flat field!
  • Flatter image compared to SCT and aplanatic/corrected SCT designs
  • Hyperbolic quartz primary and secondary mirrors with 99% reflectivity dielectric coatings for carbon fibre RC 8", RC 10" and RC 12" models   
  • Carbon-fibre optical tubes have outstanding thermal stability
  • Hyperbolic quartz primary and secondary mirrors with 96% reflectivity enhanced aluminium coatings for metal tube RC 10" & RC 12"   
  • Crayford style large 2" 10:1 microfocuser on RC 8" astrographs
  • Crayford style LINEAR 3" 10:1 microfocuser on RC10"/12" astrographs
  • Laser etched focuser drawtube setting scale 
  • RC 6" has a metal tube, BK7 mirrors (not quartz), Crayford style 2" microfocuser, 40mm of microfocuser drawtube travel (not 50mm) and 
    a Skywatcher/Vixen style full-length (32cm) dovetail bar
  • RC 8", 10" & 12" have long 50mm drawtube travel (not 40mm)
  • RC 10" and RC 12" models have upgraded/smoother/stronger stainless steel reinforced Crayford 3" LINEAR 10:1 microfocusers!
  • We will better any genuine competitor's genuine offer, if they have in stock exactly the same model w/same specifications and accessories!

The advantages of RC *Ritchey Chrétien“ Astrographs for astrophotography:
The RC Astrograph is a real Ritchey-Chrétien reflector telescope. A high end optics known for their expencive price, now made available with an an affordable price for our indian amateur astronomers.

Contrary to Maksutovs or Schmidt-Cassegrains which have a spherical mirrors and need image correctors, and contrary to Newtonians that need coma correctors. The RC system is a well corrected for Astro-Photography that uses only mirrors (hyperbolic primary- and secondary mirror). (no false colour) and does not require any corrector with any cameras.

RC Telescope is better, than Schmidt Cassegrain telescopes with correctors.
This is also the advantage of RC telescopes against SCT telescopes. These telescopes needs a lens corrector wich is integrated in the optical system. The RC is a true reflection system without lens corrector and with a very bright image.

Good-bye Coma: An RC has virtually no coma (stars look like little comets around the edges of the field), which means there will be greater image quality across a wider field of view.

No Chromatic Aberration: Because a Ritchey-Chretien does not use lenses or corrector plates, the design does not suffer from chromatic aberrations, or false color. If you've ever looked through an achromatic refractor (non-APO), you will have seen chromatic aberration.

No Spherical Aberration: The use of hyperbolic mirrors for both the primary and secondary removes the problem of spherical aberration from this optical system, an optical effect caused when light rays do not all come to focus at the same point, resulting in an image that is not in perfect focus.


Quality Excellence Award
Aug 2011

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