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GSO 8" Ritchey-Chretien Carbon Tube - FREE DELIVERY

In stock
can be shipped within 1-2 days

Price without VAT or delivery

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 due to the difficulty in making a Hyperbolic mirror. However GSO, best known for their excellent Newtonian optics have been able to mass produce such mirrors and offer an instrument that is superior in most aspects to a conventional Schmidt-Cassegrain, yet still comes at a very affordable price.

This 8" F8 Astrograph was designed for full illumination of "35mm format" (24 x 36mm) sensors. 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.

Since the optical layout of the RC uses no lenses or corrector plates there is no false colour at all.

To further enhnace the performance of this small Astrograph, we offer various focus options, from motorisation of the standard focuser to full focuser upgrades.

The GSO RC has a generous back focus allowing you to attach many accessories like e.g. off-axis-guiders, filter wheels etc.

Each GSO telescope we supply is carefully checked and collimated before supply.


Type: 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 1624mm

Focal Ratio F8

Primary Mirror Quartz - Surface quality 1/12 Lambda or better with 99% dielectric high-reflectivity coating

Secondary Mirror Quartz. 99% dielectric high-reflectivity coating. Collimatable cell.

Tube Carbon Fibre tube with metal primary and secondary mirror cell, weight 6.1kg

Computer-optimized baffles Tube uses computer-optimized baffles for optimum suppression of stray light.

Focuser 1:10 Monorail focuser for extremely smooth focusing. 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 top of the OTA and a 3" Losmandy format on the underside of the tube.

Scope of Delivery

8" F8 RC Astrograph

2" focuser with 1.25" adaptor

1 x Vixen GP Dovetail Plate

1 x Losmandy Dovetail Plate

2 x M90 50mm Extension Tubes

Technical Details

Weight 6.2 kg

Obstruction 85 mm

Tube length 580 mm incl. focuser

Tube diameter 230 mm

Prism rail length 395 mm

NOTE: For use with a diagonal you will require the following extension tubes. For 2" diagonal 50 mm, for 1.25" diagonal 80 mm



Product Note Status Price
Astrograph 3.0" R&P Focuser with M117 Thread Astrograph 3.0" R&P Focuser with M117 Thread
£332.50 *
Optec TCF-LEO Low Profile Motor Focus Optec TCF-LEO Low Profile Motor Focus
£1,145.83 *
* Prices without VAT or delivery
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Browse these categories as well: GSO, Ritchey Chretien Astrographs
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