[ATM] Question on my lap for 8" F6

[Scotto1234 at aol.com (Scotto1234@aol.com)]

In a message dated 3/1/2004 5:25:09 PM Eastern Standard Time, 
David_A._Stevens%GM@gm.com writes:
Are you sure it is oblate and not just a deep hole?? The shadows would just
be reversed. Are you using a slitless tester or pinhole or slit?? Which
side are you cutting the knife from?? Are you starting inside the ROC or
outside??
No, I'm not sure of anything any more.  I am using a slitless tester (does 
this make a difference?).  I am cutting from the right (standing behind the 
tester looking at the mirror)  I am starting inside the ROC and moving the source 
and knife away from the mirror.  Outer zones null first as I move away from 
the mirror, then the inner zones progressively as I move away from the mirror.  
This is what has me convinced that I have an oblate spheroid and not a deep 
hole, but I may not know what I am talking about, since I have never done this 
before.  I can send some photographs of my tester, etc., if you give me an 
e-mail address that can accept attachments.  Any help would be appreciated.

Scott