GSO Ritchey-Chretien Astrograph Telescope
Best specialized optical tube for intermediate deep sky astrophotographers.
Designed for serious deep-sky imaging, this optical tube assembly delivers a flat, coma-free field of view without the need for complex corrector lenses. Its fixed-mirror design eliminates image shift, making it a reliable workhorse for capturing high-resolution celestial data.
$2699.00
at
Agena AstroProducts
Who it's for
- Astrophotographers seeking crisp star images across the entire sensor
- Imagers working in environments with significant temperature fluctuations
- Mobile observers needing a powerful reach in a manageable size
Who should skip it
- Beginners who prefer a maintenance-free plug-and-play experience
- Visual observers focused primarily on high-contrast lunar and planetary detail
- Users unwilling to invest in additional high-end focusing hardware
Performance breakdown
Imaging Precision
Hyperbolic mirror design delivers exceptional, coma-free clarity across the entire frame.
Thermal Stability
Quartz mirrors and active cooling fans minimize focus drift during long sessions.
Mechanical Rigidity
Fixed-mirror construction eliminates image shift, ensuring rock-solid performance for deep-sky work.
Focuser Accuracy
Dual-speed linear bearing focuser provides the fine control needed for critical sharpness.
Contrast Performance
Internal baffling effectively suppresses stray light for deep, high-contrast black backgrounds.
Setup Complexity
Demanding collimation requirements make this a tool for experienced astrophotographers only.
Key Specs
Aperture
250mm
Focal Length
2000mm
Focal Ratio
f/8
Optical Design
Ritchey-Chretien
Total Weight
35.125 lbs
Focuser Size
3.25 inches
Optical Coating
Enhanced Aluminum with Quartz overcoat
Tripod Included
No
Power Source
8xAA batteries
Connectivity
M56x0.75 threaded output
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