I'm planning to shoot star trails with My Nikon D90. I'm going to use a Nikkor 18-105 VR lens. I'd like to know the ideal settings for shooting star trails, including what type of white balance and metering to use.
Star Trail Photograph is one of the most challenging activity, I've learned it from here: http://www.jamesvernacotola.com/Resources/How-To-Photograph-Star-Trails/12233655_V7cX4D http://www.nikonusa.com/en/Learn-And-Explore/Article/h0ndzhvw/photographing-the-night-sky-star-trails.html
I've not done star trails but I've done a few moon shots.
Specific things for the D90 are that you need a very solid tripod as the D90 has no mirror lockup for shooting to prevent movement/vibration. Turn off the Long Exposure NR, VR on the lens autofocus and auto-iso. If you have a remote release like the ML3 then use that otherwise use the self timer.
If it's cold / frosty and you plan to be a while then try & insulate the back of the camera to keep the battery warm, ni-mh batteries don't appreciate the cold very much.
And have fun!