Re: ATM TUE - Ronchi

["Bill & Lois Kelley" <wekelleylwk@sedona.net>]

Sorry Bob, as usual it is TDE. If you have trouble getting rid of it, E-mail
me off list. If what I have to say is worthwhile, I'll put it on list.
Best of luck,
Bill Kelley

----- Original Message -----
From: "Bob Van Deusen" <bobmsb@prairie.lakes.com>
To: <ATM@shore.net>
Sent: Monday, January 14, 2002 11:13 AM
Subject: ATM TUE - Ronchi


>
> I'm trying to finish polishing my 12" BVC mirror. I've been having
> trouble getting a smooth, but have thinned out the CEO and it's getting
> there. Now I have another problem. Using a ronchi grating, I'm getting
> the top and bottom of the lines hooking in when inside of focus and out
> when outside of focus. I think this is a TUE and hope it's not a TDE,
> but would like other's opinions. I've been using very short COC strokes.
> TIA
> Bob Van Deusen
>
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