Re: [ATM] Dew shield material suggestion request

["Malcolm Macdonald" <toliman@wave.co.nz>]

Hi Bruce

The best material I have found is the plastic ground sheet/mattress that 
backpacker campers use to sleep on, [does anyone go camping in Canada?]  It 
is about a centimetre thick, it is tough, extremely light, good insulator, 
waterproof, i.e. although it is feels spongy water will not penetrate into 
it, and cheep to buy. Just cut it to size and wrap it round the scope like a 
hooter. Perhaps not the most elegant to look at but you only use it at night 
when no one can see it.

It is also makes an excellent pad when grinding glass.

          Cheers                Malcolm


----- Original Message ----- 
From: "Bruce MacDonald" <brumac@gmail.com>
To: "ATM List" <atm@atmlist.net>
Sent: Wednesday, September 07, 2005 9:47 AM
Subject: [ATM] Dew shield material suggestion request


>I have a 10" newtonian and it was recently pointed out to me that my
> secondary is extremely close to the front opening.
>
> So close, in fact, that from some angles I can see the surface of the
> mirror.  If I can see it, so can stray light.  This also explains why
> this scope dews up so readily.
>
> I've been playing with various stuff.  So far I've tried:
> construction paper:  works, but not really opaque, and can only be
> reused until the first time it encounters dew.



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