GSO RC Ritchey-Chretien 10 f/8 OTA M-R&P (white) with EAF compatible focuser GSO Taiwan telescopes opinie

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The GSO RC OTA is an optical tube dedicated to astrophotography. A true Ritchey-Chretien system with full coma and astigmatism correction, it is the most highly regarded optical design among astronomical telescopes. This type of telescope utilizes two hyperbolic mirrors that completely eliminate coma and astigmatism, while the absence of correctors and lenses means no chromatic aberration.

The RC system was designed primarily for astrophotography. Its originators and early project implementers, American George Ritchey and Frenchman Henri Chrétien, created an excellent optical system, free of coma—the most common defect found in virtually all reflectors. The use of hyperbolic mirrors eliminated this defect, and as a mirror design, the RCT system does not exhibit the chromatic aberrations typical of catadioptric systems.

Characteristic features

• a very favorable combination of aperture, quality, weight and price - the optical system based on hyperbolic mirrors ensures the absence of chromatic aberration and coma while maintaining high resolution, relatively low weight and a very low price
• the fastest optics cooling in its class - the open design of RC tubes cools about 2 times faster compared to closed Maksutov and SCT tubes with the same aperture
• no problems with dew - dew most often settles on the meniscuses of catadioptric tubes and refractor lenses; the RC tube does not have a meniscus, so dew condensation on the optics is an extremely rare event
• high contrast - the inside of the tube has many baffles (diaphragms) and is matte blackened, which eliminates stray rays and the resulting reflections
• quartz main mirror - accuracy: not less than 1/12 λ, dielectric coatings providing 99% light reflection

Technical parameters

• Ritchey-Chretien optical system
• mirror diameter: 250 mm
• focal length: 2000 mm
• aperture: f/8
• tube weight: 15.9 kg
• weight of extensions (total): 780 g
• optical tube length: 62 cm without focuser / 73 cm with focuser
• length of the optical tube with extensions: 72 cm / 77 cm with the maximum extension
• extension range: 5 cm
• outer diameter of the tube from the front: 29.5 cm

Equipment

• 2 x dovetail in Losmandy standard
• Rack & Pinion focuser with 10:1 microfocus, graduated, compatible with ZWO EAF TBD
• front and rear tube covers
• focuser extensions (2 x 2.5 cm optical length, 1 x 5 cm optical length) TBD
• adapter for finder scope on the tube: yes, Sky-Watcher / Vixen standard

(above: sample setup with NEQ6 SynScan mounting; mounting available separately)

Below: sample photos with our working setup - GSO RC 10" (white) + EQ6-R, guider 60/280 + ASI120MM Mini, main camera: ZWO ASI 2400 MC with cooling (click to see in full size)
/ a few sessions from early autumn 2020 /










/ below: session 24-25.11.2020, Moon, RC 10, ZWO ASI 462, IR-850 (IR-pass) filters, CH4 (methane) /