GSO Mirror Diagonal
Best high performance upgrade for budget conscious amateur astronomers.
This high-end mirror diagonal offers exceptional thermal stability and durability, making it a reliable choice for both visual observation and long-exposure imaging. With its precision-machined construction and high-reflectivity coatings, it ensures minimal focus shift and maximum light throughput, providing a clear, bright view across the visible spectrum. The inclusion of a versatile adapter and protective compression rings makes it a practical, long-term upgrade for any serious refractor setup.
$135.00
at
Agena AstroProducts
Who it's for
- Budget-conscious astronomers seeking professional-grade brightness and clarity
- Observers prioritizing durability and secure equipment mounting
- Deep-sky observers wanting maximum light transmission for faint objects
Who should skip it
- Users with small refractor setups sensitive to weight distribution
- Astrophotographers who prefer premium visual styling for their gear
- Owners of telescopes with very limited inward focus travel
Performance breakdown
Optical Clarity
The 1/12-wave quartz mirror delivers exceptionally sharp, high-contrast views.
Light Transmission
Dielectric coatings ensure 99% reflectivity for bright, vivid celestial observations.
Build Durability
Precision CNC-machined metal construction feels robust and built for long-term use.
Thermal Stability
Quartz material minimizes focus shift during fluctuating nighttime temperatures.
Equipment Protection
Brass compression rings securely hold eyepieces without marring their barrels.
Versatility
Included adapter seamlessly bridges the gap between 2-inch and 1.25-inch gear.
Key Specs
Mirror Material
Quartz
Reflectivity
99%
Barrel Diameter
2 inches
Optical Path Length
97.5 mm
Clear Aperture
46.6 mm
Weight
1.19 lbs
Material
All-metal body
Know before you buy
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Ask Metto anything about the GSO Mirror Diagonal before you decide.