Re: [ATM] Hugs and Kisses

["Richard F.L.R. Snashall" <rflrs@rcn.com>]

lou krajci wrote:
  >>From: "Ken Hunter" <kb7h@cableone.net>

  >>If I have a Fused Quartz blank 20 inches diameter and
  >>2.375 thick, can it be generated into a corrector for
  >>a 20 inch Maksutov?
  >
  >
  >>I was thinking that it might not be thick enough
  >>but...

  > (And anyway, what kind of Maksutov system...Mak camera?  Mak Newt?  Mak
  > Cass?  Mak Gregorian? Mak Brachyt?....)
  >
  > Also, can you slump the disk?  The reason I ask is that Masutov's
  > calculations/examples I've read so far were typically for a meniscus 
that
  > was 0.1D thick...in other words for a 20 inch corrector you need a
meniscus
  > 2 inches thick.  Ouch.  The only way to get that with your blank is
to slump
  > it.  (I don't know enough optical design to say how thin you can 
make the
  > meniscus...and still retain its useful properties...achromaticism, etc.)

As long as you are suggesting sagging and some are suggesting two
lenses up front:

the "hugs" (O) version unMak Cass:

	http://users.rcn.com/rflrs/unmak1-06x.len

the "kisses" (X) version unMak Cass:

	http://users.rcn.com/rflrs/unmak1-07x.len

At least it has a good Photopic Strehl ratio: 0.992 at the
edge of the 42 mm diameter field.

-- 

Rick S.

http://users.rcn.com/rflrs



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