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Re: [ATM] Fine Grind already Blanchard ground mirror blank back?

Michael Fremont wrote:
> I just received a 16" 1.625" thick pyrex blank from Newport Glass.  It
> is pregenerated to f4.5 and Blanchard ground on the back.
>
> Having looked through the archive, I'm still unsure whether I should
> fine grind the back at 220 grit even though it's Blanchard ground; and
> am further unsure that I can even do it, since the front already has a
> curve.
>
>   
You can, but not much point.  Depends on whether it needs to be for your 
cell design.

Ken Lowther
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