In my never ending desire to "tweak" I am now looking at a mirror cell for my 10", f/4.48, 1.875" thick, Pyrex mirror.
Using the calculator found here:
http://www.digilife.be/club/johan.vanbeselaere/atm/optics/mirrorcell/Mirrorcell.htm
I get the following:
supported by 3 points on the edge = lambda/12
supported by 3 points on 70% of the radius = lambda/35
supported by 9 points flotation system = lambda/299
supported by 18 points flotation system = lambda/451
If we tolerate 1/4 of the Rayleigh tolerance (lambda/32 surface peak-to-valley), which seems reasonable, allowing room for other defects such as figure errors in both mirrors, bad seeing, etc., than this mirror should be supported by 3 points on 70% of the radius!
Is the difference in the 3-point lambda/35 and the 9-point flotation lambda/299 going to be something noticable at the eyepiece?
Thanks,
Mark
Using the calculator found here:
http://www.digilife.be/club/johan.vanbeselaere/atm/optics/mirrorcell/Mirrorcell.htm
I get the following:
supported by 3 points on the edge = lambda/12
supported by 3 points on 70% of the radius = lambda/35
supported by 9 points flotation system = lambda/299
supported by 18 points flotation system = lambda/451
If we tolerate 1/4 of the Rayleigh tolerance (lambda/32 surface peak-to-valley), which seems reasonable, allowing room for other defects such as figure errors in both mirrors, bad seeing, etc., than this mirror should be supported by 3 points on 70% of the radius!
Is the difference in the 3-point lambda/35 and the 9-point flotation lambda/299 going to be something noticable at the eyepiece?
Thanks,
Mark
