Re: ATM testing a flat mirror

["A. Suykerbuyk" <asuyker@wxs.nl>]

Hi guys,

In the past I tested several times diagonal mirrors using a artificial star
and a refractor.
Very easy, astigmatism and other problems can be seen at once.
However now I have a 33 cm flat (13 inches), not easy to find a sphere that
large.
I think I will use my 12 1/2" Newtonian for testing.
Unfortunately it will not be possible to calculate the precision of the
surface of the flat.

Regards,
Adrie Suijkerbuijk.

>Then what about using a (good!) paraboloid on a star
>and test the diagonal "in the field". But of course
>you have turbulence, dew, etc... all those things that make
>real observation an ever-renewing experience :-)
>
>Clear skies
>
>Hugues
>
>
>
>
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