Re: [ATM] A model of the Hindle Sphere test of a convex Hyperboloid

[Kevin Whitefire <chaosopher23@yahoo.com>]

You have a 1 micron tolerance, or so it seems.

Poly bags that you get at the grocery store are thin
and flexible.

Try a spring clothespin for the thin shim using the
same thickness shims everywhere else.

If this induces astigmatism, the poly bags vary in
thickness somewhat, or use a different material for
the thin shim (or thick shim) altogether.

I'll be watching this thread, because I want to make a
hyperbolic secondary for my 13.25" scope.

Kevin
--- Jonathan Lavoie <atm@lavoielactee.net> wrote:
> 
> ----- Original Message ----- 
> From: "James Lerch" <jlerch1@tampabay.rr.com>
> To: <atm_free@yahoogroups.com>; "ATM"
> <atm@atmlist.net>
> Sent: Thursday, March 31, 2005 2:14 PM
> Subject: [ATM] A model of the Hindle Sphere test of
> a convex Hyperboloid
> 
> 
> > Greetings All,
> >
> > I've been working on an OSLO model of a Hindle
> sphere null
> > test for a convex hyperboloid (a some day RC Cass,
> maybe)..
> >
> > Anyway, If I modeled it correctly, starting with
> the assumption that all 
> > the
> > optical properties are known, It would appear that
> the spacing between the
> > concave sphere and the convex hyperboloid are
> impressively sensitive to a 
> > change
> > in distance.  If I modeled it correctly, it would
> appear I have to get the
> > spacing between the two mirrors to within +/-
> 0.01mm (how exactly would I
> > accomplish that?)
> >
> 
> I think if the distance from the convex to the test
> focus is measured well,
> this implyes that distance between mirror surfaces
> is also good so no need
> to bother with that.
> 
> Jonathan
> 
> 
> _______________________________________________
> ATM mailing list http://www.atmlist.net/
> 

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