Fast parabolic primary mirror for self construction of Newtonian telescopes, made of optical quality glass BK7.
♦ Diameter 8" / 200 mm♦ Focal ratio f/5♦ Mirror substrate is optical glass BK7 (more homogeneous than standard plate glass)♦ Reflectivity: 94%♦ Optical quality: better than diffraction-limited imaging guaranteed♦ Center marked for collimation