80mm Diameter
Diffraction Limited L4 (1/4 wave in Sodium Light)
Plate Glass
Aluminized(92%) and SiO(Quartz Overcoat)
Resolving Power(arc seconds): .97
FL (focal length) 800mm
Pre Set Collimation Dot
Hand Crafted and Ronchi Tested for high Reflectivity.

• 80mm Diameter
• FL (focal length) 80mm
• Plate Glass
• Aluminized(92%) and SiO(Quartz Overcoat