From: "Jerry B. Hillman" 
To: 
Reply-To: "Jerry B. Hillman" 


Helloe everyone,
I want to thank all of you for your immediate and helpful responses.  The
general consensus of opinion that my mirror was not properly supported was
exactly right. I have posted another Ronchigram of my mirror that shows how
much proper support can help.  The 'S' is gone. I see other problems in the
mirror, primarily roughness from using a star lap but I can work on that
now that I know that it wasn't the surface of the mirror causing that weird
pattern.  I also posted pictures of my current testing equipment.  The
tester is elavated about 4 1/2 feet off the floor. The mirror is at floor
level. This would correspond to the lowest level towards horizontal that I
am likely to use the scope. Now, onward towards that parabola. Clear skies,
Jerry

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