trying out a dew sheild

Hi

just made this dew sheild earlier and was wondering has
anyone else here tried anything similiar?
If so how well does it work? is this enough to keep dew away
for an extra hour or two? will I need a dew heater aswell.
I was out observing lastnight and I barely got an hour and
my telescope was all fogged up, so im getting pritty fustrated.

Any advice greately appreciated.

Cheers
Derek.

Hi Derek,

First of all, what is the material you made the dew shield from? A 'classic' dew shield is just an extension onto the end of the tube, more for SCT's and refractors. However, further repelling of dew can be obtained for all scopes by using that foam stuff that can typically be found in camping shops as sleeping bag underlay. It has to power to absorb moisture from the air but becomes useless on much larger aperture instruments (after a certain size, an observatory isd the best defense).

Ultimately, a dew heater is the best way to go.

Seanie.

Hi Seanie

All its made from is 3mm thick poster paper, and I put lots of layers
of duck tape inside and outside to keep that dry.
a long shot eh!

cheers

barr wrote:

Hi Seanie

All its made from is 3mm thick poster paper, and I put lots of layers
of duck tape inside and outside to keep that dry.
a long shot eh!

cheers

Long Shot? You won't see where that lands! Your cardboard idea is a good one, but on an intense night it will just get damp and flop on itself becoming a nuisance. Off the top of my sleepy head I can't think right now what else in the home you could use...

Well Seanie your idea of the foam stuff does sound like a
better one, so I hope tomorow night is clear and ill give this
one a try and see what happens:) :huh: : angry:
O ya are the ones that can be bought from celestron and meade
any better or would theese home made ones give the the same results.

Thanks Seanie.

Derek

I use a sheet of camping bed foam and it works perfectly.
Costs less than 10euro.

Michael.