Typical OA-7.0 Primary
Clear Aperture 178 mm
F.L. 1720 mm
Measurement Instrumentation: Custom built Double Pass Fizeau Interferometer.
Operates at F/1.5 to accommodate large fast F/ratio optics.
The appearance of a down edge is due to the fast F/ratio of the interferometer and is not related to
the 7 inch primary mirror as wavefront values and Strehl Ratio indicate.