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[ATM] back to longer FL
The FL of the second 12 inch f/5 mirror for the binoscope I want to build is
1.2% shorter at the moment than the FL of the mirror I already finished.
This should be less then 1%. Getting it to, lets say 0.8% difference means a
shallowing of the sagitta of the second mirror with 0.03 mm (0.0012"). I
just finished finegrinding with Carborundum 600 and have to do 800 and 1200.
Is it possible to to go back in sagitta this far with those two grits, or
should I go back to a grinding with a coarser grit?
Jan
http://home.wanadoo.nl/jhm.vangastel/Astronomy/
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