Re: [ATM] Grinding questions

[Dale Eason <atmpob@yahoo.com>]

I can't answer this question but once I took my
Celestron Comet Catcher ( a Schmidt Newtonian) to a
telescope optician, sale person, and survice center. 
I was asking about taking it apart.  He told me that
to make sure I know the orientation of the corrector
because it was matched to the defects in the mirror
and needed to be put back the same way.  If this is
true of your scope then what you are doing may not
work well.  

Maybe others can comment

Dale Eason

--- John Stephen <atmlist.net@johnstephen.org> wrote:

> Would a difference in thickness affect the operation
> of the corrector plate
> (due to a change in distance) or would it be more of
> a problem for the
> travel of the focuser?  If I decide to ditch the
> plate glass and switch to
> Pyrex then perhaps I can find a good thickness match
> (the existing mirror is
> Pyrex).  My alternative is to just re-work the
> original mirror instead, but
> I'm afraid of screwing it up and not having a
> working scope anymore, so I've
> have been avoiding that option.
> 
> Thanks,
> - John
> ----- Original Message ----- 
> From: "Bill" <astronutski@yahoo.com>
> To: "ATM List" <atm@atmlist.net>
> Sent: Wednesday, October 06, 2004 6:58 AM
> Subject: Re: [ATM] Grinding questions
> 
> 
> > One thing I would add as far as the focal length
> is concerned is
> > don't forget to factor in the mirror thickness
> compared to the
> > original.  I don't know what's in there but would
> assume it's thicker
> > than 3/4".
> > -Bill 
> 
> 
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> ATM mailing list http://www.atmlist.net/
> 



		
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