From: "Rob" 
To: "Ken Hunter" ,
        
Reply-To: "Rob" 


Thanks for the info, I didn't think I would get a reply that quickly :)
Also I apoligize for the double post..Sorry

I'm hoping to buy a CCD camera, although they seem a bit expensive. That's
one reason why I wanted to build that telescope. I've been looking at some
of the pictures from these scopes and they are very impressive..I drooled
over one of the SBIG CCD cameras for a while. Until I found out it was a
little over 6000 dollars.. I'd really like to have a color CCD that I could
do long exposures with. But at that kind of price it's not going to happen
anytime soon...
----- Original Message -----
From: "Ken Hunter" 
To: "Rob" ; 
Sent: Tuesday, February 25, 2003 11:15 PM Subject: Re: ATM Ritchey-Chretien
telescopes


> Rob...
>
> A parabolic curve and a hyperbolic curve are done exactly the same way as
far as construction is concerned. The
> difference between the 2 physically is determined on whether you blink
both eyes or just one while doing the final
> figuring. There's not much difference, just in the amount of
"correction"
that you give the mirror's surface. If you can
> make a parabola, you can make a hyperbola... it's just a wee bit more
trouble proving that's what you have.
>
> You say you are going to take some pictures... are you looking for wide
flat fields or will you be using a CCD camera?
> It makes a difference depending on the size of the required flat area. I'm
sure that you will get more info on this from
> the other guys so I'll back out and let them chime in.
>
> Have fun!
>
> Ken Hunter
>
>

--- BBBS/NT v4.00 MP