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Ronchi and Foucault Tests on the 20" f/4.5 Quartz Telescope Mirror

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Uploaded on Apr 29, 2010

Both of the twin 20" quartz telescope mirrors are finished. Gordon puts the "A" disk on the test stand and shows how the Foucault test and the Ronchi test look. This mirror's test is reported by FigureXP to be better than /30th-wave, with a Strehl ratio better than 0.98. This is one of the mirrors that Gordon wrote about in the Cloudy Nights thread entitled "Making twin 20" quartz mirrors."

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