While in Colorado last week I thought I'd try a night-sky exposure using my D300 and my dad's tripod. After taking a couple of shots using the 50mm (because it's faster than my zoom lenses) I went to the 10-24mm lens and set it at 10mm and the aperture wide-open at f/3.5. I set my ISO to 800, focused the lens to infinity at the Milky Way, and then took pictures at ever-increasing time exposures. I put the garage in the frame to give myself a point of reference (I was just fooling around, anyway). Then I pressed and held down the shutter-release button, using the stopwatch on my smartphone to see the elapsed time. The last picture, exposed for 122 seconds, shows the most detail but it's a little fuzzy because I was holding down the button and not using a cable release (I thought about bringing it but didn't). What's in the image is a portion of the Milky Way running through the constellation of Aquila.
I'm no astrophotographer, but it was fun for me to experiment and see what I could get.
(Shot with the Nikon D300 using the 10-24mm zoom at 10mm; manual exposure mode; aperture set to f/3.5; exposure time 122 seconds; ISO 800; auto white balance; normal JPG.)