Ritchey-Chrétien High-Performance Reflecting Telescope GSO 203/1624 1:10 OTA

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Ritchey-Chrétien Reflecting Telescope GSO 203/1624 1:10 OTA - Only tube with accessories, without mounting, without tripod

Article No.: GSORC8M
Manufactured by: GSO
Shipping weight: 11 kg

Our price: 1297.95 €

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Ritchey-Chrétien Reflecting Telescope GSO 203/1624 1:10 OTA

This Ritchey-Chrétien telescope is a high-performance reflecting telescope designed to deliver exceptionally sharp and contrast-rich images of the night sky. Thanks to its advanced optical design, it is an excellent choice not only for astrophotography but also for visually observing deep-sky objects.

The telescope uses two precisely shaped hyperbolic mirrors that work together to minimize common optical imperfections. As a result, you get a wide, flat field of view with pinpoint stars across the entire image — without the need for additional optical correctors.

Why choose a Ritchey-Chrétien telescope?

✔ Hyperbolic mirrors for extremely sharp images and a wide field of view
✔ Optical design that corrects spherical and coma aberrations
✔ No chromatic aberration, unlike Schmidt-Cassegrain or Maksutov-Cassegrain systems
✔ Quartz mirrors with very low thermal expansion for stable focus
✔ High-reflectivity dielectric coatings for bright, high-contrast views
✔ Open tube design allows fast cooling and quicker setup

With a primary mirror diameter of 203 mm and a focal length of 1624 mm (f/8), this telescope offers an excellent balance between image detail and ease of use. The dual-speed Crayford focuser (1:10) allows precise and smooth focusing, which is especially helpful when using cameras.

Thanks to its professional-grade optics and robust mechanical construction, this telescope is ideal for users who want to explore galaxies, nebulae, and star clusters with confidence — whether visually or through imaging.

Technical specifications

Optical design: Ritchey-Chrétien reflecting telescope
Primary mirror diameter: 203 mm
Focal length: 1624 mm
Focal ratio: f/8
Tube weight: 8.2 kg
Focuser: 2″ Monorail, dual-speed (1:10)
Eyepiece connection: 2″ and 1.25″
Thread: M90x1
Mounting rails included: Vixen + Losmandy

This telescope for astrophotography and visual observing is a reliable, long-term investment for anyone looking to experience the universe with exceptional clarity and precision.

Specifications

Type of telescope: Newton reflectors

Optical scheme: Ritchey-Chretien

Focal length: 1624 mm

Aperture: 203 mm (8″)

Aperture ratio: 8

Resolving capacity: "

Limit value: 13.3 magnitude

Light gathering capacity: 841x

Max. useful magnification: 406x

Connection type: 2″

Mounting: No mount

Recommended for: Advanced, Experienced

Application area: Astrophotography, Deep Sky observation, Planets observation

Package contents of "Ritchey-Chrétien Reflecting Telescope GSO 203/1624 1:10 OTA":
✅ Ritchey-Chrétien 8″ OTA telescope
✅ Vixen dovetail bar
✅ Losmandy dovetail bar (3″)
✅ 2″/1.25″ reducer (adapter)
✅ M90x1 extension tube 50 mm
✅ M90x1 extension tube 25 mm (2 pcs)

Typical magnifications

The recommended magnification is highlighted in yellow.
D = telescope aperture in millimeters

Maximum useful (2D):
406x
(with a 4 mm eyepiece)

Maximum Useful Magnification (2D)
The highest magnification that a telescope can realistically use. Above this value, the image becomes dim, blurry, and shows no additional detail due to optical and atmospheric limits.

Resolving (1.4D):
271x
(with a 6 mm eyepiece)

TIP: Binorum Plössl 6mm 52° 1.25″ Planetary Eyepiece

39.75 €

Resolving Magnification (1.4D)
The magnification at which the telescope reaches its maximum resolving power. Fine details become visible, but increasing magnification further does not improve sharpness.

High (1D):
203x
(with a 8 mm eyepiece)

High Magnification (1D)
A strong magnification suitable for detailed observations of the Moon, planets, and close double stars under good atmospheric conditions.

Optimal (0.7D):
148x
(with a 11 mm eyepiece)

Optimal Magnification (0.7D)
The best overall magnification for most observations. It provides a good balance between image brightness, contrast, and detail, and is often the most comfortable to use.

Medium (D/2):
102x
(with a 16 mm eyepiece)

Medium Magnification (D/2)
A versatile magnification range suitable for many deep-sky objects, such as star clusters and galaxies, as well as general lunar observing.

Low (D/3):
68x
(with a 24 mm eyepiece)

Low Magnification (D/3)
A wide-field magnification used for scanning the sky, observing large nebulae, and locating objects before switching to higher power.

Minimum (D/6):
34x
(with a 48 mm eyepiece)

Minimum Magnification (D/6)
The lowest practical magnification of a telescope. It provides the widest possible field of view and is mainly used for star fields, Milky Way observations, and object finding.