I just recently got a Nikon D50 with the kit 18 - 55 lens and have always wanted to take Bulb shots. So now that I have a dSLR I'd like to give it a shot and wanted to know if anyone had any tips / suggestions as far as technique, settings... or anything else. My game plan at this point would be to scope out an interesting subject (one that won't move obviously) and compose the shot about 1/3 subject, 2/3 sky. Use an aperture around F8-ish and then just trial and error it until I get something good. Any suggestions? How long would I need to expose to get noticable star trails?