Quote:
Originally Posted by gary
As I understand it, to fabricate a segment, the clever part was to polish
a blank as a sphere whilst applying specific differing forces around the
edge of the glass. Apparently polishing a sphere is relatively easy
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Ha ok. Sounds like what Celestron was doing to mass produce their corrector plates. They had a few bases machined with an inverse profile that had the corrector shape then vacuum the glass on top of it, polish it flat then when released the flat machined face would take the right shape.
https://patents.google.com/patent/US3889431A/en