Many cameras support external DC power.
- My Canon 20d does (I forget its voltage)
- My old Mamiya RB67 does (6 vdc)
- My Fuji s9100 does (5 vdc)
- My Kodak x812 did (3 vdc)
- The Nikon D90 does (7.4 vdc)
- etc
The trick is going to Radio Shack (or in my case YOU DO IT ELECTRONICS in Needham MA) and getting the proper plug and polarity, then building your own battery pack. I've done this several times and it is a sweet addition to your digital camera.
For example:
4 * 1.2v NiMH cells delivers 4.8 vdc which is just about perfect for any 5 volt device.
3 * 1.2v NiMH cells delivers 3.6 vdc which worked perfectly on my Kodak.
And there are high-amp RC (Remote Control) batteries at 7.6 vdc which could externally power a Nikon for DAYS!!
Just takes a little fiddling with wiring and some research.
Michael
P.S. don't screw up the polarity!!! You can cause an internal fuse to blow (been there, done that!)
-----Original Message-----
From: Gregory [mailto:fyrframe@xxxxxxxxxxxxxx]
Sent: Sunday, February 1, 2009 06:59 PM
To: 'List for Photo/Imaging Educators - Professionals - Students'
Subject: Re: DSLR's in cold temperatures
It seems I have heard there was some "extension cable" that allowed the batteries in the camera to be moved to pants pocket to keep them warm and the camera functioning. Any truth to that memory? Take care out there, Gregory www.fireframeimaging.com www.ebbtidegalleryofgifts.com http://soundexposure.org
