I understand that for night shots, it is better to use a fast film like ISO 800 or 1600. However, I have some ISO 400 film and a tripod that I'd like to use to take a bulb shot of the night sky (I live near an air force base and would like to see what planes I can catch). What kind of results should I expect? Will there be too much noise? Or does the film speed not matter at all since I'm using a tripod?