From: J-Engineering 
To: "atm{at}shore.net" 
Reply-To: J-Engineering 


Hi All.

I am working on laying out a Ronchi and a Foucault tester.  The design is
such that the beam emerges from a hole in front of frosted glass. How big
should the hole be?

The beam returns through a 12 mm hole.  How close should these two holes
be?  Is 12 mm center to center OK?  Mirrors will be in the f/5.5 to f/7
range.

I am using a JMI focusser as a linear guide so the tester will need to fit
in a 1-1/4 inch dia adapter.

Thanks for your help!
--
Ray
Ray{at}J-Engineering.com

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