GSO RC Ritchey-Chretien 6" f/9 M-CRF OTA

GSO Ritchey-Chretien 6" f/9 Optical Tube Assembly for Astrophotography

The GSO Ritchey-Chretien 6" f/9 Optical Tube Assembly (OTA) is meticulously crafted for astrophotographers who demand precision and clarity. This specialized optical tube proudly features a genuine Ritchey-Chretien (RC) system, renowned for its ability to correct coma and astigmatism, ensuring superior image quality without the need for additional correctors or lenses, thereby eliminating chromatic aberration.

The RC design, originally pioneered by George Ritchey and Henri Chrétien, provides an unparalleled experience in astrophotography by delivering images free from common optical flaws like coma. The hyperbolic mirrors at the heart of this system ensure that your images are crisp and clear, devoid of the chromatic issues often seen in other telescope designs.

Key Characteristics:

• Optimal Balance: Offering an excellent combination of aperture, quality, weight, and price, the GSO RC OTA delivers exceptional image clarity, free from chromatic aberration and coma, at a competitive price point.
• Rapid Cooling: Thanks to its open-tube design, this RC OTA cools approximately twice as fast as closed-tube systems like Maksutov and SCT of the same aperture.
• Minimal Dew Issues: Unlike catadioptric tubes and refractor lenses that are susceptible to dew, the GSO RC's design minimizes condensation, keeping your optics clear.
• High Contrast: The interior of the tube is lined with multiple baffles and coated in a non-reflective black material to prevent internal reflections and glare, enhancing image contrast.

Technical Specifications:

• Optical System: Ritchey-Chretien
• Mirror Diameter: 150 mm
• Focal Length: 1350 mm
• Aperture Ratio: f/9
• Tube Weight: 5465 g
• Extension Weight (including 3 pieces): 535 g
• Optical Tube Length: 40.5 cm (without extender) / 50.5 cm (with extender)
• Optical Tube Length with Extensions: 60.5 cm / 64 cm (fully extended)
• Tube Outside Diameter: 18.5 cm (at the front)

Included Equipment:

• Vixen standard dovetail, 32.5 cm in length
• Crayford 2"/1.25" dual-speed focuser with a 3.5 cm range and microfocus capability
• Front and back tube caps for protection
• Extenders for the focuser (2 x 2.5 cm optical length, 1 x 5 cm optical length, 77.5 mm diameter)
• Tube finder adapter compatible with SkyWatcher/Vixen standard finders

In summary, the GSO Ritchey-Chretien 6" f/9 OTA stands out as an excellent choice for astrophotographers seeking a high-performance optical system. Its ability to correct coma and astigmatism, combined with its avoidance of chromatic aberration, rapid cooling capabilities, minimal dew-related issues, and high contrast makes it an ideal option for capturing the cosmos with precision and clarity.