My home-cast 12.5 inch diameter, light-weight, honeycomb-back telescope mirror on the Foucault testing stand. The door to the Foucault testing tunnel is opened allowing ambient light to back-light the mirror, causing the honeycomb structure of the mirror to appear and show through. The mirror is quite oblate at this stage of polishing. Air currents stirred up by opening and closing the door are quite visible. Taken with a hand-held video camera aimed at the Foucault tester monitor. You can learn more about how I cast this mirror myself at [ Ссылка ]

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