From: "Thomas" 
To: "Emery Greg" 
Cc: 
Reply-To: "Thomas" 


If it ain't pierced now don't do it. This will screw with the figure what
ever it may be. I would look at newt versions of the clasic cass, DK or RC
there are other options but they are my pick.

The problems with full ap correctors is their size, a 12" slab of BK-7
or similar is going to cost you.....

Thomas.
----- Original Message -----
From: "Emery Greg" 
To: "Marco Miglionico" 
Cc: 
Sent: Tuesday, June 03, 2003 3:19 AM Subject: Re: ATM 12in ex military mirror.


> Hi Marco:
>
> With that fast of a mirror I would say off-hand, Schmidt-Newt, Mak-Newt or
some other type of corrector-Newt (Lurie-Houghton, Ross).
>
> Are you willing to pierce the primary?  How about a Cass Variant?
SCT,Mak-Cass, RC.
>
> ttfn
> greg
>
>
> ----- Original Message -----
> From: Marco Miglionico 
> Date: Monday, June 2, 2003 12:26 pm
> Subject: ATM 12in ex military mirror.
>
> >
> > Hello Again.
> >
> > I've had an interesting thing happen. I've managed to acquire
> > an ex-military 12in mirror. It is 2in thick. The focal lenght is
> > about 1m, which makes the mirror about F3.4. This is all I know
> > about it though. Oh, I think it has a standard aluminium coating.
> >
> > I don't know what type of glass it is. I don't know if the mirror
> > is paraboloidal or spherical.
> >
> > The problem is this. What am I going to do with it?
> > It's far too fast for a newtonian. (Would paracorr help much?)
> > I guess I'll have to find out if it is parabolised. But how do
> > I do that?
> >
> > I've thought about a schmitt newtonian configuration.
> > Has anyone got any advice and/or ideas. I would love some help on
> > this.
> > Should I send it away to get tested by a mirror manufacturer?
> >
> > Thank you
> >
> > Marco Milgionico
> >
> > www.geocities.com/telescopiman
> >
> >
> >
> >
> >
> >
> >
>

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