Hello, I want to try out some night sky photography with my D2x and I was looking for some help. I've never shot anything like that at all (I'm used to sports and spot news). I'd really like to try to get something where the shutter speed is long enough that you actually get the spin of the Earth showing, where the stars kind of make a circle in the sky. Can anyone help me with this? I really have no clue where to begin. I figure I'll have to do some playing around to get something that really works, but any pointers at all would be a GREAT help. Thanks a lot!