Ritchey-Chrétien astrographs

GSO made, true RC (Ritchey-Chretien) with a hyperbolic primary and a hyperbolic secondary mirror. No glass corrector plates or lenses in the optical train. Quartz mirrors with 99% high reflectivity coating.

Product variants

  • GSO Ritchey-Chrétien 152/1370 OTA

    GSO Ritchey-Chrétien 152/1370 OTA (GSRC6M)

    incl. 27% VAT

    420.00 €
    Including 27% VAT:
    420.00 € (147 000 HUF)
    Net price (for non-EU customers):
    330.71 € (115 748 HUF)
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    Stock avalability
    Budapest shop:
    Limited stock (1 piece). Please contact our colleagues before ordering: +36-1-202-5651
    Delivery:
    Delivery in 24-48 hours
    Bp. shop:Limited stock
    Delivery:Delivery in 24-48 hours
  • GSO Ritchey-Chrétien 203/1624 OTA

    GSO Ritchey-Chrétien 203/1624 OTA (GSRC8M)

    incl. 27% VAT

    848.57 €
    Including 27% VAT:
    848.57 € (297 000 HUF)
    Net price (for non-EU customers):
    668.17 € (233 858 HUF)
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    Budapest shop:
    Stock refill in progress (currently not in stock)
    Delivery:
    Delivery in 24-48 hours
    Bp. shop:Stock refill in progress
    Delivery:Delivery in 24-48 hours
  • GSO Ritchey-Chrétien 203/1624 Carbon Tube OTA

    GSO Ritchey-Chrétien 203/1624 Carbon Tube OTA (GSRC8)

    incl. 27% VAT

    1 134.29 €
    Including 27% VAT:
    1 134.29 € (397 000 HUF)
    Net price (for non-EU customers):
    893.14 € (312 598 HUF)
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    Stock avalability
    Budapest shop:
    Stock refill in progress (currently not in stock)
    Delivery:
    Limited stock (1 piece). Please contact our colleagues before ordering: +36-1-202-5651
    Bp. shop:Stock refill in progress
    Delivery:Limited stock
  • GSO Ritchey-Chrétien 254/2000 OTA

    GSO Ritchey-Chrétien 254/2000 OTA (GSRC10M)

    incl. 27% VAT

    2 105.71 €
    Including 27% VAT:
    2 105.71 € (737 000 HUF)
    Net price (for non-EU customers):
    1 658.04 € (580 315 HUF)
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    Budapest shop:
    For order only
    Delivery:
    Please contact our colleagues before ordering: +36-1-202-5651
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  • GSO Ritchey-Chrétien 254/2000 Carbon Tube OTA

    GSO Ritchey-Chrétien 254/2000 Carbon Tube OTA (GSRC10)

    incl. 27% VAT

    2 734.29 €
    Including 27% VAT:
    2 734.29 € (957 000 HUF)
    Net price (for non-EU customers):
    2 152.98 € (753 543 HUF)
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    Stock avalability
    Budapest shop:
    For order only
    Delivery:
    Please contact our colleagues before ordering: +36-1-202-5651
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    Delivery:For order only
  • GSO Ritchey-Chrétien 305/2432 OTA

    GSO Ritchey-Chrétien 305/2432 OTA (GSRC12M)

    incl. 27% VAT

    3 077.14 €
    Including 27% VAT:
    3 077.14 € (1 077 000 HUF)
    Net price (for non-EU customers):
    2 422.95 € (848 031 HUF)
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    Budapest shop:
    For order only
    Delivery:
    Please contact our colleagues before ordering: +36-1-202-5651
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    Delivery:For order only
  • GSO Ritchey-Chrétien 305/2432 Carbon Tube OTA

    GSO Ritchey-Chrétien 305/2432 Carbon Tube OTA (GSRC12)

    incl. 27% VAT

    3 791.43 €
    Including 27% VAT:
    3 791.43 € (1 327 000 HUF)
    Net price (for non-EU customers):
    2 985.38 € (1 044 882 HUF)
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    Stock avalability
    Budapest shop:
    For order only
    Delivery:
    Please contact our colleagues before ordering: +36-1-202-5651
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    Delivery:For order only
  • GSO Ritchey-Chrétien 406/3250 Truss Tube OTA

    GSO Ritchey-Chrétien 406/3250 Truss Tube OTA (GSRC16Truss)

    incl. 27% VAT

    6 105.71 €
    Including 27% VAT:
    6 105.71 € (2 137 000 HUF)
    Net price (for non-EU customers):
    4 807.65 € (1 682 677 HUF)
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    Stock avalability
    Budapest shop:
    Stock refill in progress (currently not in stock)
    Delivery:
    Limited stock (1 piece). Please contact our colleagues before ordering: +36-1-202-5651
    Bp. shop:Stock refill in progress
    Delivery:Limited stock

More about the product

Ritchey-Chrétien (RC) telescopes are known for their excellent optical performance, especially for photographical applications. At the same time however RCs were always notorious for being very expensive. To change this the well-known US-based distributor "Astro-Tech" asked GSO to produce true RC telescopes. GSO is best known for their excellent Newtonian optics which they have built for many years now.

The result of this joint venture is an instrument that is superior in most aspects to a conventional Schmidt-Cassegrain, and still comes at a very affordable price. Teleskop-Service is European distributor for these instruments from GSO.

The 8" f/8Astrograph was designed for full illumination of the "35mm format" (24 x 36mm). For cameras with a small sensor, particularly most CCD cameras, no field flattener is needed. For cameras with a larger sensor we recommend the use of a field flattening lens. (Currently under development.)

Since the optical layout of the RC uses no lenses or corrector plates there is no false colour at all. Also you will not need to use an IR cut filter, thus increasing the effective light-gathering power of the instrument.

Optical Design:True RC (Ritchey-Chretien) with a hyperbolic primary and a hyperbolic secondary mirror. No glass corrector plates or lenses in the optical train.
Optical Characteristics:Aperture 8" (203mm), Focal Length 1624, Focal Ratio f/8
Primary Mirror:Quartz - surface quality 1/12 Lambda or better. The primary mirror has a 99% dielectric high-reflectivity coating.
Secondary Mirror:Quartz. The mirror has a 99% dielectric high-reflectivity coating. Robust collimatable cell. Obstruction is 42,5%.
Tube:CF tube with metal primary and secondary mirror cell - complete weight 6,1kg
Computer-optimized baffle system:The inside of the tube is lined with computer-optimized baffles for optimum suppression of stray light.
Focuser:1:10 Crayford focuser for extremely smooth focusing. The dual speed 1:10 focusing knob is particularly important for astro imaging. No image shift and up to 5kgs load capacity! The focuser accepts 2" and 1.25" accessories.
Dovetail mounting rail:A GP-style dovetail rail is mounted on the underside of the tube. It fits in all mounts that accept GP / Vixen dovetail plates.



The 10" f/8 RC Astrograph can illuminate a field diameter of max. ca. 60mm (including optional RC corrector). Without corrector, the usable field has ca. 30mm diameter. Here, you have a pure mirror system that can be used without UV/IR cut filter. Most of the CCD cameras are sensitive in this spectral range.

The image is absolutely free from chromatic abberations and the resulution is higher than most apochromatic refractors in this price range.

 

 

Optical Design:true RC system consisting of a hyperpolic main- and secondary mirror.
Optical dimensions:Aperture 10" (254mm), focal length: 2000mm, Photographic speed: f/8
Primary mirror:Quarz - precision 1/12 Lambda or better. The main mirror is shifting free and fix installed. Reflectivity 99%, dielectrical coating.
Secondary mirror:Quarz with 99% reflectivity coating. Mounted fully adjustable in a stiff cell. Central obstruction: 112 mm (44%)
Tube:Metal design weight 15.7 kgs, Carbon design weight 14,6 kgs. Length 735mm incl. 3" focuser, tube diameter 294mm.
Focal plane:110mm behind 2" connection - enough space for accessories
Baffling system:Computer optimized, highest straylight supression.
Focuser:Heavy-duty 3" monorail focuser (see description below)
Prism rail:Losmandy-style 3" prism rail, adapts directly to Losmandy, CGE pro and other mounts.

 

 

Recommended accessories

If you buy a new telescope, you can choose two Plössl eyepieces or one Planetary eyepiece for 12000 HUF (abt. 40€). Please advise the exact size in the cart.
Stock avalability
Budapest shop:
Continuously in stock (4+ pieces)
Delivery:
Delivery in 24-48 hours
Bp. shop:Continuously in stock
Delivery:Delivery in 24-48 hours
Add to basket37.50 €

You are eligible for accessory discount only when purchased tugether with a main product. Up to two accessories of a kind.

Astronomical telescopes up to 100 Euros
Astronomical telescopes between 100 and 200 Euros
Microscope offer up to 200 Euros



Discount

4mm LACERTA Ultra Wide Angle FV=82 deg
4mm LACERTA Ultra Wide Angle FV=82 deg
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-37% 89.98 €
7mm LACERTA Ultra Wide Angle FV=82 deg
7mm LACERTA Ultra Wide Angle FV=82 deg
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72/432 Lacerta ED APO with Octo focuser in alu case
72/432 Lacerta ED APO with Octo focuser in alu case
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1-2-3 and I will be astronomer
1-2-3 and I will be astronomer
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Continuously in stock (4+ pieces)
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Delivery:Delivery in 24-48 hours
-15% 92.51 €

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