i just got a canon ae-1 for christmas. i've been toying around with it for the last few days and testing it out. it's really the first time i've ever gotten my hands on on a manual 35mm camera. i'm having a lot of fun. anyhow, i've been messing around with the long exposure capabilities all day. tomorrow, we're supposed to have a clear night sky, and i'd like to take a super long exposure of it (not sure how long. i'm thinking a few hours) to get some cool star trail shot or two. only, i'm still learning a lot about f-stops and the like, so i was wondering if any of you who have done something like this can give me any tips for night time photography. it would be much appreciated.