Re: [APML] Coping with dew

["joe" <jmize@svic.net>]

Chris;


     I second Steuart's suggestion although I had a problem down here in
Central Fla.  When the Sun comes up in our high humidity and outside temps
rise so fast my AP-155mm's objective always used to dew up like a glass of
iced tea, even at 80deg.

     I found a higher tech Dew Controller which does what the Kendricks
can't, it monitors the objective's temprature.  I haven't had a morning dew
problem since I started using DewBuster.  You can use the Kendricks heater
strips or other similar heating strips.
http://www.gbronline.com/ronkeating/controller/dewbuster.htm

     The six port DewBuster has two ports which are controlled by a temp
sensor to sense the air and objective temps like Optec does on their TCF-S
focuser.  There is a temprature control knob to set the actual temprature
the objective is heated above the dew point.  There are six other ports like
the Kendricks controller which run 40% of the time...  joe  :)

I'm not affiliated with DewBuster.  It is just a good idea taken one step
further.


"May You Go Among The Imperishable Stars"

Joe Mize:     jmize@svic.net
StarFields Observatory   http://www.svic.net/jmize
Chiefland, FL    29:24'33.4"N    82:51'37.7"W
Moon Phase:     http://tycho.usno.navy.mil/cgi-bin/phase.gif

----- Original Message ----- 
From: "Stuart Heggie" <stuart.j.heggie@sympatico.ca>
To: "Discussion of Film Astrophotography" <astro-photo@seds.org>
Sent: Monday, September 29, 2003 6:25 AM
Subject: Re: [APML] Coping with dew


> Chris -  I use Kendrick's system of dew heaters and honestly, they do
> not change the temp of the objective very much at all but keeping it
> above the ambient seems to make a world of difference.
>
> Stuart
>
> chrish@easynet.co.uk wrote:
>
> >I had a long photography session last night (my first with this rig),
some 6
> >hours in total. By the end of that time my Genesis SDF was heavily
dewed -
> >including the objective. I need to do something about that but how much
heat
> >can you get away with using before damaging image quality? I had
carefully
> >cooled the thing down for an hour before starting so it seems a bit
stupid to
> >start heating the thing up again. How do you guys cope with it?
> >
> >ChrisH
> >
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