Re: ATM 11.2" F/2 Primary testing questions :)

["James W. Burrows" <burrjaw@earthlink.net>]

At 14:49 2002-01-01 +0100, Nils Olof Carlin wrote:

>Dave Rowe wrote:
>
> > 3) Not Quite a Null Test (NQNT).  This is identical to 2) above, but 
> without the nulling lens.  By calculation or ray tracing, you can 
> determine the residual longitudinal aberration for a point source not 
> quite at infinity, and then do some data reduction to find the surface 
> profile of the mirror under this test condition.
>
>I believe Sixtests would handle this situation correctly without further 
>data reduction - right Jim?

Yup.  In fact, Sixtests requires you to put in the distance from mirror 
vertex to fixed source, anticipating such situations and not making you 
guess the mirror's ROC.

         -- Jim Burrows
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