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Re: ATM Analysis of Nasmyth/Cass in OSLO Lt
Pat Ferrick wrote :
> I finally managed to get a design for a Nasmyth-Cassegrain telescope
...
> Spot size: 0.012 mm (8% larger than the diffraction limit)
> Wavefront error: 0.05 waves RMS, 0.16 waves peak-to-valley
Why residual wavefront errors ? With perfect paraboloid/hyperboloid
you should be way into 1/1000th of a wave of residual error...?
> Astigmatism: 0.6 waves (S and T)
How did you manage to get astigmatism on axis ?
Something's wrong here ...?
Bratislav