From: "Bob Mazzullo" 
To: 
Reply-To: "Bob Mazzullo" 


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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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