Interferometric Data

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.