Secondary Mirror Plan 88mm (Small Aperature) for Newton - Kepler GSO

The Kepler GSO 88mm (small axis) flat secondary mirror is designed for Newtonian telescopes, ideal for those who want to improve their instrument or build their own telescope. Made by the renowned Taiwanese brand GSO, this elliptical mirror features high optical quality and excellent reflection.

Characteristics:

• Type: Flat secondary mirror
• Shape: Elliptical
• Size (small axis): 88 mm
• Thickness: 20 mm
• Material: Low thermal expansion BK7 glass
• Surface treatment: Multi-layer "Enhanced Aluminium" with 93% reflection rate
• Protection: Upper layer of silicon dioxide (SiO2) for increased durability
• Optical quality: "Diffraction limited" with excellent surface condition

Advantages:

• High reflectivity with 93% reflection for better light transmission
• BK7 glass mirror for rapid thermal equilibrium, reducing thermal effects
• Ideal for custom telescope construction or upgrading existing instruments

Compatibility:

• Suitable for Newtonian telescopes of various sizes equipped with elliptical secondary mirrors
• Compatible with GSO Dobsonian telescopes

Tips and tricks:

• When replacing a secondary mirror, ensure proper optical alignment for optimal performance.
• Gently clean the mirror surface with a soft, dry cloth to avoid scratches.

Improve your observations with the Kepler GSO 88mm secondary mirror, an essential component for superior optical performance.