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Old Monday 18th September 2017, 23:50   #4
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Join Date: Aug 2015
Location: Germany
Posts: 1,367

actually Canon-Optron is manufacturing the objective lenses for the fluorite Takahashi scopes (and most other companies using fluorite elements like Kowa, Vixen, Borg).

I don't know if they do hand finishing for those, but they are pretty good at it - the Zygo reports on the page linked below list figure P/V of 24nm - or 1/20th wave and surface roughness of 3nm - but on a lens...

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