GSO RC 254/2000 Truss Carbon OTA

GSO RC 254/2000 Truss Carbon OTA

Overview

The GSO RC 254/2000 Truss Carbon OTA is a premium astrograph for astrophotographers using APS-C or full-frame sensors. The Ritchey-Chrétien design, based on hyperbolic mirrors, delivers a coma-free and flat field without spherical aberration — making it ideal for high-end deep-sky imaging.

Its carbon fiber truss construction ensures mechanical and thermal stability throughout long sessions, keeping focus steady even under night-time cooling.

Technical specifications

• Optical design: Ritchey-Chrétien (hyperbolic mirrors)

• Aperture: 254 mm

• Focal length: 2000 mm

• F-ratio: f/8

• Primary mirror: hyperbolic BK7, 94% reflectivity

• Secondary mirror: 105 mm diameter, hyperbolic

• Central obstruction: ~41%

• Backfocus: approx. 254 mm from rear flange

• Structure: carbon truss with CNC-machined aluminum ends

• Weight: approx. 15.2 kg

• Focuser: 3" Monorail, 1:10 micro reduction, 2" and 1.25" adapters

• Accessories:

  • Losmandy rails (top and bottom)

  • Extension rings for backfocus adjustment

  • Mirror dust covers

Optical performance

• Field correction: native coma-free and flat field

• Field flattener: optional, recommended for full-frame sensors

• Sensor compatibility: APS-C, full frame, up to 43 mm

• Use cases:

  • Galaxy clusters, planetary nebulae, compact nebulae

  • Scientific photometry, spectroscopy

  • Ideal for fixed observatories or mobile observatories with good setup

Mount compatibility

To fully exploit this OTA’s capabilities, it must be installed on a robust equatorial mount with excellent guiding and payload stability.

iOptron mounts:

• CEM70/CEM70G – 31.8 kg capacity, portable yet stable

• CEM120/CEM120EC – 52 kg capacity, for fixed or semi-permanent setups

10Micron mounts:

• GM1000 HPS – high accuracy tracking with absolute encoders

• GM2000 HPS II Combi – ideal for permanent installations

• GM3000 HPS – for dual setups or additional heavy equipment

Highlights

• Professional RC design with hyperbolic mirrors

• Carbon truss OTA for long-term focus stability

• Wide 254 mm aperture with flat coma-free field

• Robust 3" focuser supports heavy imaging trains

• Mount-compatible with top-tier systems like iOptron and 10Micron