Todd Peach , Nov 02, 2003; 02:08 p.m.
Condensation on camera gear isn't as big a deal in Seattle as you might think (I'm a native).
Number one cause of condensation is taking a cold-soaked camera into a warm moist environment. Where the cold surface contact moisture laden air, water droplets will form, just like an iced-tea glass. This is a bugger if it's *inside* your camera or lens.
The usual first line of defense for this form of condensation is to seal your gear in individual zip-lock bags with all the air squeezed out. You do this while you're still outside in the freezing air. Then you bring your camera bag inside and let it warm gradually by itself. When the temperature neutralizes, you can unwrap the baggies.
It's not often that cold around here. Now if you go up in the mountains to one of the ski areas, it's a different story.
For typical wandering around Seattle in our normal drizzle, I don't take any particular precautions. I'm usually wearing a jacket that's big enough to 'shield' the camera if it really starts coming down (though that usually fogs the eyepiece from body heat). I carry a cotton bandanna for wiping water off the surface of the camera and barrel of the lens.
I don't shoot much with a D100, so if they're more sensitive, I wouldn't know. I've used F100, N90s, F3, F2, FE, FM around here in the rain, no problems.