[ATM] Dew shield.

[atmpob at yahoo.com (Dale Eason)]

Sky and Telescope magazine has a good article on thier
web site about dew shields see here:

http://skyandtelescope.com/howto/scopes/article_150_1.asp

Dale Eason

--- Marco Miglionico <marco.pm@btopenworld.com> wrote:
> Hello all fellow astronomolisationismalists (and
> scope makers).
> 
> I have a few questions about dew shields as I cannot
> find info on them.
> 
> 1/ How does a dew sheild work?
> 
> 2/ What is the best material to make it from?
> 
> 3/ Is is only useful for scopes with large amounts
> of glass at the top
> end or can a newtonian benefit from one?
> 
> 4/ Is it also supposed to help prevent heat from the
> observer crossing the
> optical path?
> 
> 5/ Does it do the same job as heat rope?
> 
> Any answers much appreciated.
> 
> Thanks,
> 
> Marco Miglionico,
> 
> Scotland, Edinburgh.
> 
> Cloudy, wet, rainy, low pressure, jet stream right
> above my head 256 days a
> year,
> more neon, argon, sodium and xenon light pollution
> than the whole of a
> galaxy whose inhabitants love artificial light put
> together, and if I get
> good seeing it means that polaris only looks like a
> jellyfish as opposed to
> an octopus on bad nights. The Enkle gap is just a
> myth.
> 
> www.geocities.com/telescopiman
> 
> _______________________________________________
> ATM mailing list http://www.atmlist.net/


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