GSO RC 355/2845 Truss Carbon OTA

GSO RC 355/2845 Truss Carbon OTA

Overview

The GSO RC 355/2845 Truss Carbon OTA is a professional-grade astrograph designed for permanent observatory installations. With its Ritchey-Chrétien optics and 99% reflective quartz mirrors, it provides a wide coma-free field with perfect flatness for large-format imaging sensors.

Its carbon truss structure ensures excellent thermal equilibrium and mechanical rigidity. The heavy-duty 3" focuser supports advanced imaging gear and long optical trains.

Technical specifications

• Optical type: Ritchey-Chrétien, hyperbolic mirrors

• Aperture: 355 mm

• Focal length: 2845 mm

• F-ratio: f/8

• Mirrors: Quartz, 99% dielectric coating

• Central obstruction: 41%

• Backfocus: 233 mm from rear flange

• Structure: Carbon truss with CNC-machined aluminum

• Weight: approx. 30 kg

• Focuser: 3" Crayford with 1:10 micro-reduction, 2" and 1.25" adapters

• Included:

  • Top and bottom Losmandy rails

  • Extension rings

  • Mirror and focuser dust caps

Optical performance

• Flat field without coma or spherical aberration

• Full-frame sensor coverage (up to 60 mm diagonal)

• Designed for:

  • Planetary nebulae

  • Galaxy clusters

  • Scientific spectroscopy or photometry

Mount compatibility

Due to its weight and precision optics, this OTA is ideal for:

iOptron mounts:

• CEM120 / CEM120EC – 52 kg payload for observatory-grade setups

10Micron mounts:

• GM2000 HPS II Combi – high-end tracking and encoder integration

• GM3000 HPS – 100 kg capacity for multi-instrument configurations

Key advantages

• Professional RC system for coma-free wide field

• Quartz mirrors with high thermal and optical stability

• Heavy-duty focuser supports full-frame imaging setups

• Modular design, perfect for observatory integration

• Ideal pairing with high-end harmonic or encoder-based mounts