From: "mommoteandcoyote" 
To: "Matt Considine" 
Cc: 
Reply-To: "mommoteandcoyote" 


Matt and Rick S.

In a box, in the basement, in the back of the shop I have a 6" F/9
optical set based on that very idea. all that is left to do is figure the
meniscus corrector. I haven't looked at them in years.... They are there
though! interested in playing Guys?   Let me go get em... all the math and
general
specs are in the box with them, I think.... "Oh Fun!!"

Talk with you soon,
Coyot‚


----- Original Message -----
From: "Matt Considine" 
To: "Richard F.L.R. Snashall" 
Cc: 
Sent: Wednesday, January 22, 2003 8:13 PM Subject: Re: ATM An Old TMs Simple Query


>
> The back can be curved - it doesn't need to be flat.  In fact, if half the
required curvature is
> put on both sides of the plate, you avoid having the back of the plate act
as a flat reflector
> for ghost images.
>
> If I understand that design correctly, shouldn't the figure of the
"secondary" spot have the
> same polynomial coefficients as the corrector surface it sits upon?
>
> Or are you putting two different curves onto the plate?  Wouldn't that be
tough to make?
>
> Matt
> (who hasn't made a plate yet)
>
> > I have wondered for some time "Why the Schmidt always had a flat
> > corrector plate?".  If it could be curved, the backside could
> > then be used as a Cassegrain secondary, similar to that used in
> > the Gregory Maksutov.
> >
> > I have added something like what I am asking at:
> >
> > http://users.rcn.com/rflrs/newsch1-04x.len
>
>
>
>

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