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GSO Ritchey-Chretien 203mm f/8, metal tube with ESATTO 2"


GSO 203mm f/8 Ritchey-Chretien with metal tube is a great compact telescope for long exposure astrophotography and it uses and ESATTO 2" robotic microfocuser to perfectly focus also heavy cameras and accessories. Thanks to the optional corrector it offers a large corrected field.

Composed of

ESATTO 2" robotic focuser
GSO Ritchey-Chretien 203mm f/8 with metal tube


GSO Ritchey-Chretien 203mm f/8, metal tube with ESATTO 2": main features

GSO 203mm f/8 RC telescope with metal tube is perfect for those looking for a quality telescope for deep-sky astrophotography at an incredible price. Designed to fully illuminate even the largest sensors (up to FullFrame 24x36mm), it has a corrected field for sensors up to APS-C and offers an optional field flattener for sensors up to FullFrame.

  • GSO telescope is a Ritchey-Chretien 203mm f/8 with metal tube
  • ESATTO is the best robotic microfocuser, perfect for astrophotography


GSO Ritchey-Chretien 203mm f/8, metal tube with ESATTO 2



GSO Ritchey-Chretien 203mm f/8, metal tube with ESATTO 2": the advantages

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. 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. 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.

GSO Ritchey-Chretien 203mm f/8, metal tube with ESATTO 2
GSO Ritchey-Chretien 203mm f/8, metal tube with ESATTO 2" and the following optional accessories: EAGLE with PLUS dovetail clamp installed above the telescope.



ESATTO: the more advanced and affordable robotic microfocuser!

ESATTO is the new generation robotic focuser that you control by any Windows computer by connecting it to a USB port, or via WiFi by using ESATTO app on your smartphone or tablet with the Virtual HandPad! On the camera side, ESATTO has a M56x1 male thread to connect and manually rotate many cameras and accessories by adding the optional adapters with stop rings. The 2” version of the ESATTO 2" has a depth of 67mm, it has 15mm of focuser tube travel, a 5kg payload capacity and an incredible resolution of 0,04 micron per step (and this is why we call it ESATTO)! And you can also expand ESATTO features by adding the ARCO robotic camera rotator!



GSO Ritchey-Chretien 203mm f/8, metal tube with ESATTO 2": scope of delivery

- Optical tube Ritchey-Chretien 203mm f/8

- Metal tube

- ESATTO 2" robotic microfocuser

- Double Vixen dovetail bar (below and above optical tube)

- M90 extensions to reach focus

Hard/soft case
Support rings
Diameter (mm)
Optical Tube
Focal Length (mm)
Primario e secondario iperbolici
8,5 Kg
Eyepiece holder
50,8mm con riduttore 31,8mm
Focal Ratio
Optical Design
Field flattener/corrector
Non incluso (opzionale)


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