[ATM] Re: Second Thoughts on Mirror Support

[djd521 at comcast.net (Don D'Egidio)]

Hey guys,

The proof is in the seeing, pun intended. :-) I didn't want to start a 'you can't do that, or you can't do this' kind of discussion. The mirror in my Discovery TD shows no problems with being RTV'd in place. Many in our club have looked through the scope and have the same opinion. The original poster asked what would happen in his situation with using RTV and a 9 point flotation system. I gave him my honest experiences with using my scope for 3 years now, without a flotation system. I will keep the mirror RTV'd for now.

Maybe I don't experience many problems because the telescope is stored in my shed and is basically at ambient temperature at all times. There is very little cool down needed, unless the temp is dropping fast during the night. Even then I don't see any astigmatism caused by the RTV.

Don

----- Original Message ----- 
From: "Peter" <peter@kitgear.com>
To: "The Amateur Telescope Makers List" <atm@atmlist.net>
Sent: Wednesday, February 04, 2004 15:02
Subject: RE: [ATM] Re: Second Thoughts on Mirror Support


> Andy,
> 
> You got it!! RTVing an optic is a terrible thing to do.
> 
> "IMHO gluing a mirror to a solid substrate having
> a different CTE is asking for trouble. Mounting a
> commercial scope this way is just a way to save $."
> 
> 
> Andy Saulietis
> ISS Enterprises
> 10 Milky Way
> PO Box 19
> Mayhill NM 88339
> 
> 
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