Qu'est-ce qu'on peut voir avec le TS-Optics GSO RC 8″ ?

Avec 203 mm de diamètre ouvert à f/8 et 1624 mm de focale, c'est d'abord un instrument d'astrophotographie : avec une caméra, il est fait pour photographier les petits objets : galaxies, nébuleuses planétaires et amas globulaires, qu'il montre en grand.

Est-il facile à transporter ?

Il reste transportable en voiture : le tube pèse environ 8,25 kg pour environ 58 cm de long.

Faut-il le collimater ?

Oui, de temps en temps : un Ritchey-Chrétien demande un alignement précis de ses deux miroirs, surtout après un transport. Un outil de collimation pour Ritchey-Chrétien facilite le réglage, que l'on affine ensuite sur une étoile.

Peut-on faire de la photo ?

Oui, c'est sa vocation : il se monte sur une monture équatoriale motorisée (non fournie) avec une caméra astro ou un appareil photo. À f/8 et 1624 mm de focale, il demande un suivi précis : prévoyez un autoguidage pour les longues poses. Avec un tube d'environ 8,25 kg (sans accessoires), choisissez une monture dont la capacité de charge laisse de la marge.

Ritchey-Chrétien TS-Optics GSO 8" - Deep space astronomy

Name: Ritchey-Chrétien TS-Optics GSO 8" - Deep space astronomy
Brand: TS-Optics
Price: 949.00 CHF
Availability: BackOrder

Product description

TS-Optics GSO 8″ RC Pro 203/1624 – The Gold Standard in Ritchey-Chrétien Astrographs

The Ritchey-Chrétien TS-Optics GSO 8″ RC (203 mm, 1,624 mm, f/8) is designed for high-resolution astrophotography, but is also perfectly suited to visual observation. With its hyperbolic quartz mirrors (fused silica) with 94 % reflectivity and its ventilated open tube, it guarantees stable focus, bright images and fine stars across the entire field.

Highlights

Genuine Ritchey-Chrétien naturally corrected, coma-free field.
Quartz mirrors focus stability even at varying temperatures.
Reflectivity 94 % direct gain in brightness and contrast.
Open tube + ventilation rapid cooling, better contrast.
Generous backfocus (≈159 mm) ideal for correctors, gearboxes, OAGs and filter wheels.
No shifting : primary fixed, developed by 2" Monorail Focuser.
Two Vixen bars simple mounting of guidescope or piggyback camera.

Astrophotography

The 8″ RC delivers sharper, brighter astrophotos than comparable SCT or Maksutov sensors. Without correctors, sensors up to APS-C are perfectly usable. For full format, an RC corrector is recommended. With the CCD47 reducer 0.67×the focal length increases from 1624 mm to ≈1088 mm and the f/8 ratio to f/5,36which means twice as fast installation times.

The 2″ Monorail Focuser

More rigid than a classic Crayford, the 2" Monorail" combines fluidity and stability: solid stainless steel slide, no tilt when locked, 360° rotation for framing, 1:10 gear ratio for precise focusing, graduation for easy focus retrieval, motorization compatibility.

Why RC rather than SCT?

No Schmidt blade less susceptible to fogging, maximum transmission (including IR).
Design-corrected field Fine stars in the center and on the edges.
No residual aberration no permanent corrector in the optical path.
No mirror shift : fixed primary → maximum stability in long exposure imaging.

In the box

8-inch f/8 RC Telescope (203/1624)
Focuser Monorail 2″ (with 1.25″ adapter)
Two Vixen-style dovetail bars (GP)
M90 extension rings
Protective cap

In a nutshell

The TS-Optics GSO 8-inch RC Pro is a high-end yet affordable solution for astrophotographers looking for a stable, bright telescope with field-wide correction. With its optional accessories (corrector, reducer, OAG, filter wheel), it can easily be upgraded to advanced, high-quality setups.

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Frequently asked questions

What can you see with the TS-Optics GSO RC 8″?

With an aperture of 203 mm at f/8 and a focal length of 1,624 mm, it is primarily an astrophotography telescope: When used with a camera, it is designed to photograph small objects—such as galaxies, planetary nebulae, and globular clusters—which it displays in great detail.

Is it easy to carry?

It can still be transported by car: the tube weighs about 8.25 kg and is about 58 cm long.

Should we aim it at him?

Yes, from time to time: a Ritchey-Chrétien telescope requires precise alignment of its two mirrors, especially after being transported. A collimation tool for a Ritchey-Chrétien telescope makes it easier to adjust, and you can then fine-tune it using a star.

Can we take pictures?

Yes, that's what it's designed for: it mounts on a motorized equatorial mount (not included) with an astro camera or a regular camera. At f/8 and a focal length of 1624 mm, it requires precise tracking: be sure to use autoguiding for long exposures. With a tube weighing approximately 8.25 kg (without accessories), choose a mount with a load capacity that leaves some margin.

Technical specifications

Optical type: Ritchey-Chrétien
Diameter: 203 mm
Focal length: 1,624 mm
Focal Ratio (f/D): f/8.0
Maximum magnification: 406 ×
Separating power: 0.57″
Lens holder: 2" dual-speed monorail with 1.25" adapter
Backfocus: 254 mm from the rear of the tube (159 mm from the 2″ fitting); M90×1 thread
Illuminated Field: 30 mm
Corrector / Reducer Available: Yes
Conversion tools / reducers in-store: TS-Optics 2″ 0.67× CCD Reducer – For RC, Astrophysics gearbox for RC 0.67x
Tube length: 58 cm
Tube weight: 8.3 kg
Uses: Deep Sky, Astrophotography