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To: "Bob Mazzullo" ,
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Let me stop you and others right here. We and anyone else can with patience
take fine annealed pyrex to much better than 1/4 wave.
We take plate glass to this level of flatness. My 2 cents.
Pete

> From: "Bob Mazzullo" 
> Date: 2003/08/08 Fri PM 03:18:41 PDT
> To: 
> Subject: ATM questions re: annealing mirror blanks
>
> Hello all...
>
> In the Newport Glass catalog, their fine annealed Pyrex is listed as being
> "more than adequate for a surface quality not exceeding a quarter
wave".
> Now, if this level of annealing is only good to 1/4 wave, is there a level
> of annealing that should be specified that is most appropriate for telescope
> mirrors to allow you to make a mirror with a much better surface quality? To
> make a higher precision mirror should the blank be annealed to a more
> precise degree or somehow differently before grinding even starts?
>
> Thanks in advance...
>
> Bob Mazzullo
>
>

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