Anyone here have experience with long exposure night shots? I have shot a few with my Nikon D40x - but was trying to get really long ones (like 20 min) to see the stars moving. I know how this works on film but perhaps it just doesn't work with CCD. What do you think?

Here's the best one I got - airstream trailer



Any experience? I'm thinking long (20 min) exposure, small aperture, low ISO

Help

Thanks - TO'B