Testing the 22" Binoscope Mirror After Fine Grinding

Gordon Waite used a digital spherometer to test the radius of curvature on one of the two 22" f/4.0 binoscope mirrors.

[@phonotical]

was really hoping for a video of the binoscope in use1d like a great project!

[@zimbabve1050]

Крутая полировка!

[@ghlscitel6714]

Shouldn't the mirror be parabolic and not spherical?

[@GordonWaite]

For most typical telescope mirrors, you make them spherical first, and then alter them to be parabolic. The final goal is a parabola.

[@ghlscitel6714]

@@GordonWaite I see. How large is according to your experience the deviation between the ideal theoretical paraboloid and the real practically crafted surface curvature?
How do you measure it?

[@zimbabve1050]

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