[ATM] Question about "Null-testing"

[John Moore <jamoore42@yahoo.com>]

Hi Everyone;
                              this is my first post, so I will introduce myself;
I'm 46, Live in Fort Worth,TX,USA, I love to build Telescopes[anyone surprised], I have 
studied, built telescopes[of and on] since I was 12, I LOVE IT!, but due to Family life
at the age of 21, that came to a halt! ,Now after a 15 year absence, I now have the time,
wisdom, and patience, to return to the "craft" I loved and missed.
 
Ive studied the archives now for 2-weeks, Alot! has changed since I left
in the early 80's,WOW!!,,The Knowledge has expanded a hundred-fold!
 
I would also like to thank all the Knowledge-able people on this list that
help the People just-getting started in this great hobby of ours,, wish this 
kind of help was available  when I got started,,,U guys are great!!
 
Now to my Question;
 
I'm finishing-up an 8-inch f/6 mirror,  Ive got about 6-more hours left to-go
before my laser-light says I'm done,  My main Test tool's that I used back 
in the 80's are "Foucault & blinking-pin & Ronchi Tests". Now I would like 
to add the "RossNull" test to my Repertoire. I have gathered plenty of Info
on how to proceed with the test,, but my Question is;;
 
                   ----Please bear with this Scenario-----
 
Is-not a Null test Considered a Qualitative test?,,
If so, does not the null-lens if say"Guaranteed 20th wave on the wave-front"
or better with all other aberration's being equal in quality,,,
Does-not the worker have the right to say that he [If he has the skill] has 
in his hands a "Qualitative"-optic" of better than 20th wave?
 
Thanks to-all,,and any help in this theory of mine will Be appreciated!!
 
John Moore.   "May your days be Bright and your night's clean and clear"
 
jamoore42@yahoo.com
 
 







		
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