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Old 23-07-2018, 01:34 PM
Billyboy78 (Bill)
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Billyboy78 is offline
Join Date: May 2018
Location: CRESTMEAD Brisbane
Posts: 103
Excuse me if I appear to skite, but I just gave the mirror a tickle with #220 then took her out into the sun to measure the FL, 1700mm, just shy of 1785 target. I've still got .5 mm to go on the sag and the sphere is not quite out to the edge. Gently gently we go with #80 grit.
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