Cassini Spherical Primary Telescope Mirror and Cell, Plate Glass w/ Quartz Overcoat

80mm Spherical Primary Mirror + Metal Cell 800mm focal length 31mm X 22mm Secondary Mirror + Metal Cell Primary and Secondary Cell Specs: OD (Outer Diameter) of Cell: 122mm ID (Inner Diameter) of Cell: 118mm Collimation Dot Diffraction limited optics(1/4 wave in Sodium Light) Plate Glass (Both Primary & Secondary) Aluminized(92%) and SiO(Quartz Overcoat) Heavy Duty Push/Pull Collimation Screws on back of Primary Cell 4 Vane Spider Cell for Secondary (31mm X 22mm) Secondary average obstruction: 25% (linear) app 6% total area. Resolving power in arc seconds: 1.4