Re: [ATM] How fast is 150mm f/3.3 lensless Schmidt?

["Bob May" <rmay@nethere.com>]

I'm trying with a 6" corr4ector and having problems with the high
vacuum needed.  This is with both sides aspherized.  Couldn't get
enough vacuum if I did it on only one side - I'd have to do it in
a pressure chambere!
Maybe if I used thinner glass I could have gotten all of the
correction on one side ut that would really have been a thin
plate.  I was using 0.170" thick glass for the ones that broke.
Bob May

rmay at nethere.com
http: slash /nav.to slash bobmay
http: slash /bobmay dot astronomy.net


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