GSO RC 305/2436 Truss Carbon OTA (RC 12")

GSO RC 305/2436 Truss Carbon OTA (RC 12")

Overview

The GSO RC 305/2436 Truss Carbon OTA is a professional-grade 12" Ritchey-Chrétien astrograph designed for observatories and high-end astrophotography. Its quartz optics with dielectric coatings offer 99% reflectivity, delivering a wide coma-free field ideal for full-frame sensors.

The carbon truss structure provides both thermal and mechanical stability, critical for long exposure sessions.

Technical specifications

• Optical design: Ritchey-Chrétien (hyperbolic mirrors)

• Aperture: 305 mm

• Focal length: 2436 mm

• F-ratio: f/8

• Primary mirror: quartz, dielectric coating 99%

• Secondary mirror: quartz, ~120 mm

• Central obstruction: ~42%

• Backfocus: ~250 mm from rear flange

• Structure: carbon truss, CNC aluminum end rings

• Tube weight: ~24 kg

• Focuser: 3" Monorail with 1:10 fine focus, 2" and 1.25" adapters

• Included:

  • Extension rings

  • Losmandy rails

  • Dust covers

Optical performance

• Fully corrected field for sensors up to 60 mm

• Free of coma and spherical aberration

• Suitable for:

  • Planetary nebulae and galaxies

  • Long focal length deep sky imaging

  • Scientific photometry or spectroscopy

Mount compatibility

Due to its size and mass, this OTA requires a stable mount:

iOptron mounts:

• CEM70 / CEM70G – light-duty option (limit use)

• CEM120 / EC / EC2 – ideal observatory solution

10Micron mounts:

• GM2000 HPS II Combi – high precision, perfect for imaging

• GM3000 HPS – suitable for heavier setups or dual OTAs

Highlights

• Ritchey-Chrétien optics with flat coma-free field

• Carbon truss design for maximum rigidity and thermal stability

• Large 3" focuser supports heavy image trains

• Built for full-frame sensors and advanced imaging workflows

• Ideal for serious amateurs and professional observatories