Re: [ATM] Calculate Astigmatism

[Ken Hunter <atm_ken_hunter@yahoo.com>]

Hmmm...

I thought the list language was supposed to be
ENGLISH...  ;0)

Ken Hunter

--- Jim Burrows <burrjaw@earthlink.net> wrote:

> Anyway, the required accuracy dR in the radii of 
> curvature on two diameters to achieve the accuracy
> dRMS from primary astigmatism is 2*sqrt(6)*(R/r)
> ²*dRMS, with r the mirror semi-diameter.  To 
> get dRMS to 5 nm (20 nm is a passing mirror) for
> Texereau's standard 8"f/6, 
> dR = 2*sqrt(6)*24²*5E-6 = .014 mm.  Oh well, R to
> the micron instead of 
> nanometer - you still can't turn the mirror to that
> level of accuracy.
> 


__________________________________
Do you Yahoo!?
Yahoo! Finance Tax Center - File online. File on time.
http://taxes.yahoo.com/filing.html
_______________________________________________
ATM mailing list http://www.atmlist.net/