Re: [ATM] Maksutov Corrector Cell Design

[Mark Holm <mdholm@telerama.com>]

Jerry Reddell wrote:


>I have come upon a  product called 'Perlite' which is a texturing material
>for paint to give a rough finish... I plan to use this in a mixture of White
>Glue and water to coat the inside of my newtonian tube and then spray paint
>it with dull black paint...It gives a sand texture while being much much
>lighter than sand.
>
>  
>
I think I recall that Perlite is a mineral product.  This makes it 
probably harder than something like sawdust or ground walnut shells that 
have been used for this purpose.  If, perhaps I should say when, some 
gets loose and ends up on an optical surface, it may be more likely to 
cause damaging scratches.

Mark Holm
mdholm@telerama.com

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