Re: [ATM] newbie question

[Nigel Weeks <nweeks@prism9.com>]

The re-coating of the optic is a very good point, as is the idea of
mounting it.

I shall go for pyrex. Thanks all!

N

On Wed, 12 Sep 2007 19:56:51 -0400, Mark Holm <mdholm@telerama.com> wrote:
> There are previous discussions in the archive, but since we don't use
> standardized phrases to refer to things, searching isn't always
> productive.
> 
> Aluminum metal as a mirror substrate has a number of problems, and some
> of it's supposed advantages turn out not to be.  A couple of examples
> follow.
> 
> 1. The ability to put mechanical features on the back or side of an
> aluminum mirror is illusory.  Sure you can put them there, but the load
> distribution won't be anywhere near good enough for any but the smallest
> mirrors.
> 
> 2. Which would you rather do when the aluminum surface gets cloudy after
> a few years of exposure to the atmosphere?
> 	a. Repolish and refigure the aluminum mirror.
> 	b. Wash off the old aluminum from a glass mirror with a bit of
> 	chemical, leaving a still polished and figured glass surface
> 	ready for recoating?
> 
> 
> --
> Mark Holm
> mdholm@telerama.com
> 
> _______________________________________________
> ATM mailing list http://www.atmlist.net/
-- 
Nigel Weeks  

 Software Engineering
 Prism9 Industries
 email: nweeks@prism9.com

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