From: "Vladimir Galogaza" 
To: "ATM shore" 
Reply-To: "Vladimir Galogaza" 


Jerry,

>.  Using this method, and altering the Conic
>value to -.75 I found where my mirror matches the Ronchi pattern. I think
>this means that I am 75% parabolized?? Please correct me if I am wrong.

I don't think that there is such linear relationship. But Math guys could see into it
and tell us. I hope also that Peter John Smith will drop in..

What is the ROC of your 16", 3/4" mirror? Regarding tester,  you
wrote first:

>Where before the ronchi test showed nice curving lines becoming closer and
>closer to what Ronchi said they should be, suddenly I have a big "S"

And then few lines later:

>KE test shows a ying yang pattern

Are the posted pictures KE or Ronchi? With Ronchi grating covering source
and image region you do not need slit and therefore no need to wary about
parallelism. But you are  doing it this
way, right?

To check if mirror is warped by its weight and bad support, you may
construct simple warping contraption* in order to flex the mirror
intentionally
and in controlled way about one diameter, and see how this will influence test
 image. If it will than it should rotate with the mirror.
(*Something similar to Bill Kelley center pull but in one diameter only).

Regards
Vladimir.

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