Astrographe Ritchey Chrétien GSO 10 "fibre de carbone View larger

GSO Ritchey-Chretien Ritchey-Chrétien RC 254/2000 carbon-fibre OTA

Ritchey Chrétien GSO 10 "

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GSO Ritchey-Chretien Ritchey-Chrétien RC 254/2000 carbon-fibre OTA

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GSO Ritchey-Chretien Ritchey-Chrétien RC 254/2000 carbon-fibre OTA

Manufacturer's product description:

GSO RC astrograph:

This is a newly developed telescope from GSO, for the first time at a more affordable price, and is especially suitable for astrophotography as it is a pure reflection system and so has no chromatic aberration. This is due to the use of two mirrors - a hyperbolic primary mirror and a convex hyperbolic secondary mirror. The image is coma-free and has a wide field of view. The open system and quartz mirror mean that RC OTAs cool quickly and there is virtually no problem with dew. This ingenious system even allows infrared photography.

The monorail focuser carries the weight on a rail, in contrast to Crayford focusers where it is carried on ball bearings, and guarantees shift-free adjustment and setting up. It is suitable for a large range of eyepieces thanks to the 3" connection and 2" reducing adapter.

The advantages in a nutshell:

  • ideal for astrophotography
  • no chromatic aberration
  • open system
  • Specifications:


    Type Reflector
    Type of build Ritchey-Chretien
    Aperture (mm) 254
    Focal length (mm) 2000
    Aperture ratio 7,9
    Resolving capacity 0,45
    Limit value (mag) 13,8
    Light gathering capacity 1320
    Max. useful magnification 508
    Tube weight (kg) 14,6
    Tube material Carbon
    tube diameter (mm) 294
    Tube length (mm) 735


    Main mirror´s construction hyperbolic
    Secondary mirror diameter (mm) 112
    reflectivity 99

    Eyepiece holder

    Type of build Crayford
    Connection ( to eyepiece) 3
    Gear reduction 1:10 Fine movement
    Rotating yes


    Mounting type no mount
    Type of build OTA
    GoTo control no
    Tracking no

    Included accessories

    Prism rail Losmandy-Style

    Area of application

    Moon & Planets yes
    Nebulae & galaxies yes
    Nature observation yes
    Astrophotography yes
    Sun not recommended (Only with appropriate Sun filter)

    recommended for

    Beginners no
    Advanced yes
    Experienced amateurs yes