[Raytrace] Dall Null

[Tom Wicker]

I have noticed something else I don't understand. When
you right click the surface data spreadsheet and scale
to convert from mm to inch or vice versa, the P-V OPD
in the wavefront graphics window scales by the same
factor.  For example, if you convert from mm to inch
the P-V OPD goes down by a factor of 25.4. I thought
P-V OPD was given in fractions of wavelength. If so it
shouldn't change with spreadsheet units.

One other thing. If I read out the wavefront data to
the text window the P-V OPD and RMS OPD are slightly
different (larger) than what is shown in the graphics window.

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