The Kepler GSO 104mm flat secondary mirror (minor axis) is an ideal solution for amateur astronomers looking to enhance their Newtonian telescope or build their own instrument. Made by the renowned brand GSO, this elliptical mirror features high optical quality and excellent light reflection.

Features:

• Type: Flat secondary mirror
• Shape: Elliptical
• Size (minor axis): 104 mm
• Thickness: 20 mm
• Material: BK7 glass with low thermal expansion coefficient
• Surface treatment: Multi-layer "Enhanced Aluminium" with 93% reflection
• Protection: Top layer of silicon dioxide (SiO2)
• Optical quality: "Diffraction limited" for a high precision optical surface

Advantages:

• Light reflection at 93%, ensuring sharper and brighter images
• BK7 glass for quick thermal stabilization and minimizing thermal distortions
• Suitable for upgrading or building custom telescopes

Compatibility:

• Compatible with large Newtonian telescopes requiring 104 mm elliptical secondary mirrors
• Ideal for Dobsons equipped with GSO mirrors

Tips and tricks:

• When installing, make sure to align the mirror correctly to ensure maximum optical performance.
• Handle the mirror carefully and clean it only with specific products to preserve the coating quality.

Enjoy superior optical quality with the Kepler GSO 104mm secondary mirror, perfect for demanding Newtonian telescopes.