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  • GSO Ritchey-Chretien 152mm f/9 con intubazione in metallo GSO Ritchey-Chretien 152mm f/9 con intubazione in metallo

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GSO Ritchey-Chretien 152mm f/9 with metal tube

Product code: GSRC6M

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Quick Overview

GSO 6" f/9 RC telescope with metal tube is perfect for astrophotography (but it can also be used for observing) and, thanks to the very compact and lightweight tube, it is a perfect traveling telescope too. This Ritchey-Chrétien telescope, 152mm diameter and 1370mm focal length, offers everything you will expect of a portable instrument for astro-imaging. It is extremely portable and offers a superb image quality, thanks to 99% dielectric high reflectivity coating on main and secondary mirror and to a large corrected flat field without need for additional correctors.

Availability: Order


Regular Price: €459.00

Special Price €425.00

22% tax incl
if you pay by bank transfer €412.25


GSO Ritchey-Chrétien (RC) telescopes are known for their excellent optical performance, especially for photographical applications. But RC telecopes are also well known for their expensive price. GSO offers a full line of true RC telescopes for the amateur to an affordable price.

Main features of GSO RC telescopes:

- True RC optics with a hyperbolic primary and a hyperbolic secondary mirror
- The secondary mirror has a center marc for better and more simple collimation
- 99% reflectivity non-tarnishing dielectric mirror coatings
- Big well corrected flat field without need of a seperate corrector
- Enough back-focus for correctors and reducer
- Less dew problems against Schmidt-Cassegrain or similar
- Fast cooling down time because it is an open system
- Each RC is tested and checked on our optical banch

The optical advantages of GSO RC Ritchey-Chrétien for astrophotography

The GSO is a true Ritchey-Chrétien reflector telescope. Contrary to Maksutovs or Schmidt-Cassegrains which have spherical mirrors and need image correctors, and contrary to Newtonians that need coma correctors, the RC system is a well corrected photographical instrument that uses only mirrors (no false colour!) and does not require any corrector with many cameras. The RC is a true reflection system without lens corrector and with a really bright image.

Optical system of GSO RC telescopes

The RC has a concave hyperbolical primary mirror and a convex hyperbolical secondary mirror. The resulting image correction throughout the field as well as the sharpness on the optical axis are superior to other telescopes. Both mirrors are ground and polished under pricision computer control to diffraction-limited or better surface accuracy.

Fixed primary mirror –with no shifting

Most similar telescopes have a movable primary mirror cell. When focusing the telescope the entire mirror is moved. Unfortunately this technique invariably leads to a certain amount of image shift. Most manufacturers have controlled this problem to a fair extent, but the remaining image shift can be quite distracting for astro-imaging, particularly with cameras with a small sensor size or when taking series of frames with several hours of total exposure time. In the GSO RC the mirror sits in a fixed mirror cell and focus is changed with a separate focuser. This eliminates the problem of image shift completely.

Long back focus

GSO RC has a generous back focus allowing to attach many accessories like e.g. off-axis guiders, filter wheels etc. If you want to take photos with a DSLR camera with the focuser in a moderate position, in order to reach the focus you need to add the GSRCV50 (50 mm spacer, to be placed between focuser and telescope) and the PLLADFOT2508L (long T2 adapter). If you want to use the GSO RC visually, you will need a 35 mm extension tube before a 2" diagonal mirror.

Technical specifications

Optical Design Ritchey-Chrétien
Optics Primario e secondario iperbolici
Diameter (mm) 152mm
Tube diameter 191mm
Focal Length (mm) 1370mm
Focal Ratio 9
Field flattener/corrector Not included (optional)
Optical Tube Alluminio
Obstruction No
Focuser 50,8mm Crayford, micrometrico
Eyepiece holder 50,8mm with 31,8mm reducer
Weight 5,4 Kg
Hard/soft case No

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