From: "Ron Newman" 
To: 
Reply-To: "Ron Newman" 


A CR2 has a racked in height of 1.4" and will go a bit below that with
out the 1 1/4" adapter.
It can also have a shorter 1.5" travel draw tube instead of the stock
2" travel draw tube if the extra tube lenght is too much.

$.02
Ron Newman
http://www.focuser.com

>
> Yes, 2" focuser, probably a Moonlite Dual Speed Crayford. The spec the
> racked in height at 1.5"
>
>
>
> Matt Simmons
>
>
>
>
>
> >From: "John Lynch" 
> >To: msimmonsmcse{at}msn.com
> >Subject: Re: ATM Secondary sizing
> >Date: Fri, 07 Feb 2003 17:51:40 +0000
> >
> >Matt,
> >
> >I'm going to use Texereau hand calculations and the Newt software to
> >work this problem.  I'll get the specs to you sometime this evening.
> >I'm assuming that you'll use a 2" focuser.
> >
> >Regards,
> >
> >John Lynch
> >
> >
> >
> >
> >
> >
> >>From: "MATTHEW SIMMONS" 
> >>Reply-To: "MATTHEW SIMMONS" 
> >>To: atm{at}shore.net
> >>Subject: ATM Secondary sizing
> >>Date: Fri, 07 Feb 2003 08:05:50 -0800
> >>
> >>
> >>I have run into a bit of a snag on my telescope design. I ran the
> >>equations outlined in K&Bs book for sizing a secondary and
came to the
> >>conclusion that I could fit a .78mm illuminated field on a 2.6"
secondary.
> >>Then, I ran the specs through Nova's Scope Designer program and it
> >>recommended a 3.1" secondary. I would like to keep the secondary as
small
> >>a possible without sacrificing too much of the light cone. Could you all
> >>look at my specs and tell me what you would do?
> >>
> >>Primary Dia = 14.25"
> >>Sec. Cage I.D. = 15"
> >>Focuser Board Thickness = .25"
> >>Focuser Height (racked in) = 1.5"
> >>F/ratio = 4.9
> >>
> >>
> >>
> >>Matt Simmons
> >>
> >>
> >>
> >>
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--- BBBS/NT v4.00 MP