Second Reflecting Telescope, Made Between 1668 and 1669, a Duplicate of the First, Presented to the Royal Society in 1671

• Aperture = 33 mm

• Magnification = 35X

• Field of View = 0.85 degrees

• Focal Length = 160 mm (f/4.8)

• Eyepiece Focal Length = 4.57 mm

• Reflectivity of Speculum Mirror = 0.40

• Transmission Efficiency of Telescope = (0.40)(0.40)(0.96)(0.96) = 0.15

• Spherical Primary Mirror and Plane Secondary Mirror, Rouge Polished on Pitch Lap by Newton

• Wavefront Error = 1/3 wave PV at Best Focus

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