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ASA 600mm f/7 Ritchey Chretien Reflecting OTA Telescope

SKU : A2-ASA600RC

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  • Special item requiring a 20% deposit when you place your order. Please email OPT or give one of our OPT telescope experts a call at 800-483-6287 to order
  • Constructed using a combination of high-grade aluminum components and high-strength carbon fiber materials in the form of an open truss tube assembly
  • Will need a corrector lens when it is used with a large-format CCD camera
  • For time frames or questions, please contact us at 800-483-6287.

Product Details

  • This product by ASA is a Ritchey Chretien Telescope optical tube assembly (OTA), which is suitable for serious research or astrophotography. The ASA 600 mm f/7 Ritchey Chretien Telescope is a relatively fast (f/7) high-quality optical system. The image is formed behind the primary mirror cell, using a perforated hyperbolic primary mirror, and focusing is accomplished by moving the hyperbolic secondary mirror along its axis by a computerized electrical drive system. This Ritchey Chretien scope is similar in functionality to a Cassegrain, except that the field correction in the absence of a field-flattener lens is slightly better than a classical Cassegrain scope would provide.

    Main Facts

    The ASA 600 mm (~24-inch) aperture Ritchey Chretien Telescope is constructed using a combination of high-grade aluminum components and high-strength carbon fiber materials in the form of an open truss tube assembly. The ASA 600 mm Ritchey Chretien (R-C) Telescope has an aperture of 600 mm (23.62-inch) or approx. 24-inch, for a focal length of 4200 mm. It has a field of view of 100mm.

    This R-C scope will need a corrector lens when it is used with a large format CCD camera. In combination with a focal reducer or a field flattener, also designed by Philipp Keller, the scope can be used with a CCD detector with a diagonal size of 70 mm and still produce pin-point stellar images out to the corners. Because your ASA R-C Telescope is designed and manufactured to perform at the diffraction limit, your imaging results will only be limited by the prevailing seeing conditions at your site during image capture and your CCD camera equipment.

    ASA 600mm f/7 Ritchey Chretien Reflecting OTA Telescope Features:

    • Aperture: 600 mm (23.62-inch)
    • Focal Length: 4200 mm
    • Focal Ratio: f/7
    • Back Focus: 210mm (without corrector)
    • FOV: 100mm
    • Primary Mirror Performance: (Hyperbolic) - 1/8 wave P/V wavefront accuracy focused, 632 nm
    • Primary Mirror Cell Support: 9-point-floating
    • Mirror Set Materials: AstroSitall (LOMO)
    • Mirror Set Coatings: Al + SiO2 with 91% reflectivity
    • Telescope Tube: Combination - aluminum and sandwiched carbon fiber
    • Weight: 211.64-pounds (96 kg)

    This ASA 600 mm f/7 Ritchey Chretien Telescope is a special order item and requires a 20% deposit when you place your order, and the balance will be required before the telescope leaves Austria. This deposit is fully refundable as long as you cancel your order before the telescope is imported. Please email OPT or give one of our OPT telescope experts a call at 1-800-483-6287, if you have any questions about this product.

    Customer Note: The images represent generic ASA R-C telescopes for illustration purposes. Your telescope might look somewhat different.

    Caution: Due to the size and weight of this telescope, it is strongly suggested that a customer have appropriate rigging gear, handling equipment, and personnel to assist, at hand when attempting to raise and attach this telescope to any mount! Use appropriate caution for personnel and equipment safety.

  • specifications

    Aperture600 mm (23.5")
    Back Focus360mm
    Dawes Limit3 arcseconds
    Focal Length4200 mm
    Focal Ratiof/7
    FreightYes
    Glass TypeAstroSitall
    Limiting Magnitude17.6
    Optical DesignRitchey Chretien
    Tube Weight211.36 lbs
  • included items

    • ASA 600mm f/7 Ritchey Chretien Reflecting OTA Telescope
    • Motorized main mirror cover
    • ADR6 ASA De-Rotator with absolute encoder (inner diameter: 160mm; Load capacity: 15kg)
    • 4 Inch Ritchey-Chrétien Field Flattener
    • 4 Inch Ritchey-Chretien Reducer
    • Client-specific camera adapter
    • Mirror substrate from Zerodur (extra charge)
    • Different mirror coating (extra charge)
    • Filter wheel

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