Hi Tom, Six 10-ohm resistors wired in series and powered by 12VDC would give a 2.4-watt heater. Probably the cheapest way to power such a gadget would be one of those small lead-acid (?) batteries used in children's electric ride-in cars -- Mattel Power Wheels and such. A car or motorcycle battery would work if you couldn't find one of these toy batteries.
I've never heard of anyone taking a portable electric hairdryer to their lenses during cold winter night photography, but there are some telescope nuts who are known to do this. Probably even a 12V fan (like a computer case fan) blowing on the lens would help a lot. Now I have to go back to sulking about the crappy overcast weather which moved in here overnight. Probably won't be any clear skies again for a few days. Glad that Saturday night and Sunday morning were clear! More later, Bill > -----Original Message----- > From: aimcompute [SMTP:[EMAIL PROTECTED]] > Sent: Monday, November 19, 2001 1:17 PM > To: [EMAIL PROTECTED] > Subject: Re: Leonid meteor shower WAS truly spectacular > > HI Bill, > > Nice anecdotes. When you mention the dew-beater-heater thing, how many > ohms > total are you talking about? Also does 12V battery mean a car battery or > will something smaller work? Thanks. > > Hope you got some good shots. Sounds like you had a great view. > Naked-eye > (with solar filter) sunspots are still visible. > > Tom C. - This message is from the Pentax-Discuss Mail List. To unsubscribe, go to http://www.pdml.net and follow the directions. Don't forget to visit the Pentax Users' Gallery at http://pug.komkon.org .
