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How hard is it to grind a mirror to exact Focal Length?
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11-12-2018, 09:08 PM
Lognic04
(Logan)
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Join Date: Mar 2016
Location: Melbourne, VIC
Posts: 889
For a dob, mirror makers let the FL vary widely. But if one wanted to grind a mirror to a specific spec it wouldn't be hard to get it +/- 5mm with a spherometer and flash polishing.
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