From: "James Lerch" 
To: "ATM List" 
Reply-To: "James Lerch" 


Greetings All,

I was going to try and tie this in with Mark's question, but I noticed the
Non-Robotic disclaimer.  

Instead, I was wondering if we might consider what predictions this makes
for the test optic, and how we might predict (IF Robo's right) what the
Interferometer is going to say..

Here's the comparison of  Sixtests vs. FigureXP for the 15 zone Robo
Results across 3 axis. The first three comparisons are with regards to b = 
-1

                    STREHL COMAPRISON
               Sixtests       FigureXP
Axis A     0.792           0.782
Axis B     0.788           0.777
Axis C     0.783           0.789

                SURFACE RMS COMPARISON (nm)
               Sixtests         FigureXP
Axis A       21.2             22.8
Axis B       21.3             22.4
Axis C       21.7             23.8

                PARAXIAL RADIUS OF CURVATURE COMPARISON (mm)
                Sixtests          FigureXP
Axis A    2828.662      2829.004
Axis B    2828.549      2828.927
Axis C    2828.641      2829.043

               BEST FIT CONIC CONSTANT COMPARISON
                Sixtests        FigureXP
Axis A       -1.004          -1.012
Axis B       -0.972          -0.981
Axis C       -1.013          -1.022

Here's my problem, I don't know ANYHING about Zernike Coefficients or
intereferometry.  If I had the interferometer report in my hands, I don't
know how I'd make a quantifiable comparison between the above Robo results
and the interferometer. (asides from publishing the data to the ATM list
and hoping for the best!)  In the back of my mind, I've just been
'assuming' it would be obvious 

For those more experienced in these matters, what conditions will need to
be meet to say "Yea, Robo seems to work" or Conversely "Ahhh
James, you've got a problem with Robo!"?

As you might be able to tell, UPS says the optic is getting REALLY close to
meeting the interferometer,and I'm experiencing a little bit of anxiety! :)

Take Care,
James Lerch
http://lerch.no-ip.com/atm (My telescope construction,testing, and coating site)

--- BBBS/NT v4.01 Flag-4