Re: [ATM] Maksutof corrector minimum thickness

[Ken Hunter <atm_ken_hunter@yahoo.com>]

I could probably slice the 20 inch blank into two
corrector disks suitable for Schmidt-Cass systems and
the 2 others are still in square slabs. Might cut
those into 4 ea 10 inch diameter Maksutov corrector
blanks. Still looking at options for this glass. I do
have the tools necessary for generating and cutting
these so it's just a matter of determining the best
use for the glass.

Thanks for all the input!

Ken Hunter


--- Dominic-Luc Webb <dlwebb@canit.se> wrote:

> On Fri, 12 Nov 2004, Ken Hunter wrote:
> 
> > Here's an exercise for the MATH whizzes on the atm
> > list...
> >
> > 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?
> 
> Sorry about the delay. No, Mak is not a realistic
> option. Using two
> correctors sounds like the collimation from hell.
> 
> Maybe a corrector for Schmidt? There is a fare
> amount of variety in
> thickness and curvature in a Schmidt corrector
> dictated by overall
> system geometry. The refractive index comes into
> play also, but as
> I recall, it did not make a huge difference.
> However, I think the
> diameter relative the primary and system focal
> length mattered a
> great deal. Reference 6 on my 310 mm Schmidt page
> has free (use at own
> risk) C source code I wrote to calculate the
> polynomials you could enter
> into  OsloLT, etc. Maybe that would help speed
> things along? Code was
> written with Unix in mind (GCC), but it is very
> simple with minimal
> dependencies on include files, libraries, etc. I am
> quite sure someone
> successfully compiled it under Windows a while back,
> but I do not have a
> Windows compiler myself.
> 
> Here is the direct link...
> 
>
http://www.megspace.com/science/stp/catadioptric/310schmidt/310schmidt.html
> 
> 
> That being said, there are exponentially fewer and
> fewer of these
> catadiotric systems anywhere on our planet when you
> get into these
> large apertures. Pretty much all the commercially
> produced and pro
> Maks on our planet are 18" or less. The case is
> similar for the
> Schmidt. A successful 20" Schmidt corrector at any
> thickness produced
> by any ATM would impress the mess out of me.
> 
> 
> Dominic-Luc Webb
> 
> 



		
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