Third Reflecting Telescope by Newton, Type-2 (Second Surface Mirrors)
Focal Length = 1200 mm (f/12)
Eyepiece Focal Length = 8 mm
Reflectivity of Hg Film on Glass Mirror = 0.77
Transmission Efficiency of Telescope = (.96)(.77)(.96)(.96)(1.00)(.96)(.96)(.96) = 0.60
Spherical Primary Mirror and Prism Secondary Mirror, Polished by Anonymous Optician
Wavefront Error < 1/5 wave PV at Best Focus
As-Built Performance: Disappointing Due to Poor Polish