GSO RC TRUSS 254/2000 Carbon OTA
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254 mm f/8 carbon Ritchey-Chrétien OTA with BK7 mirrors, 94% reflectivity, and heavy-duty 3" focuser. Designed for high-resolution imaging on advanced mounts.
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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.
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
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
To fully exploit this OTA’s capabilities, it must be installed on a robust equatorial mount with excellent guiding and payload stability.
CEM70/CEM70G – 31.8 kg capacity, portable yet stable
CEM120/CEM120EC – 52 kg capacity, for fixed or semi-permanent setups
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
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