GSO RC Ritchey-Chretien 6 f/9 M-CRF OTA - 2024 version / compatible with ZWO EAF astography otas and lenses opinie

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

The RC system was designed primarily for use in astrophotography. Its originators and implementers of the first projects: American George Ritchey and Frenchman Henri Chrétien, created an excellent optical system, free of coma - the most common defect, occurring in practically all reflectors. The use of hyperbolic mirrors eliminated this defect, and as a mirror construction, the RCT system does not show chromatic aberrations typical of catadioptric systems.

Characteristic features

• very good combination of aperture, quality, weight and price - the optical system based on hyperbolic mirrors ensures no 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 meniscus 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 matt blackened, which eliminates stray rays and the resulting reflections

Technical parameters

• optical system: Ritchey-Chretien
• Mirror diameter: 150 mm
• focal length: 1350 mm
• light intensity: f/9
• tube weight: 5465 g
• weight of extensions (total, 3 pieces): 535 g
• optical tube length: 40.5 cm without focuser / 50.5 cm with focuser
• length of the optical tube with extensions: 60.5 cm / 64 cm with the max. extension tube
• Outer diameter of the tube from the front: 18.5 cm

Equipment

• 1 x Vixen standard dovetail, length 32.5 cm
• 2"/1.25" Crayford focuser with microfocuser, extension range 3.5 cm, with scale, compatible with ZWO EAF
• covers for the front and back of the tube
• extensions for the focuser (2 x 2.5 cm optical length, 1 x 5 cm optical length, passage 77.5 mm)
• adapter for finder on the tube: yes, SkyWatcher / Vixen standard

Astrophotography test of this optical tube
Source: www.astrofotografia.eu (with the author's consent)




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