Re: ATM Robo-foucalt...is it calibrated?

["Bob May" <bobmay@nethere.com>]

The Ronchi test would be more finding the edges of the bars and comparing
them to the theoretical curves of the parabolic surface.
The tester would have to know the size of the mirror and the distance to the
mirror for inputs.  I think that the distance from the ROC can be determined
from the count of bars on the image.
The problems will be in the checking of the smoothness of the bars over the
length of them.
Bob May
http://nav.to/bobmay
bobmay@nethere.com
NEW! http://bobmay.astronomy.net