203mm Primary and Secondary Telescope Mirror set. Spherical Primary mirror Mirror Diameter: 203mm Focal Length: 750mm Focal ratio: 750/203 = 3.69 Mirror substrate: Float Glass Reflectivity=86% Optical quality: Diffraction imaging limit of 1/4 λ Secondary Mirror: Glass, 100mm x 70mm Mirrors Aluminized: 89% SiO2 surface aluminized

• Spherical 203mm Primary mirror
• Focal Length: 750mm
• Secondary Mirror: 100mm x 70mm