Re: [ATM] diagonal flat testing

["Jerry B. Hillman" <JBHillman@ev1.net>]

Hi everyone,
Looks like I didn't do the test right.  Diagonal mirror was in the wrong
position.  Should have been close to primary mirror rather than close to
light source. I'll have to try it again.  I have a worse problem.  Foucault
readings last night on the 16.5" primary do not even slightly resemble the
readings I was getting last year.  Current readings put the mirror at .03
strehl ratio. 1/0.722 pv error.  In a nutshell, junk.  Since I haven't
polished on the mirror since the readings I got last year, and the only
difference is that the mirror cell was rebuilt, perhaps the difference is
due to the mirror cell. Regardless, I don't know how to fix this since I now
can not trust any Foucault readings I take.  Star testing did not indicate
such a poor figure. I guess I won't be sending it off to be coated after
all.
Clear skies, Jerry

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