The "sunny 16" rule is a pretty good estimate for exposure to get detail in the moon. f/16 at 1/your film ISO. You could overexpose by one or even two stops from that, to get the surroundings a little lighter, and still keep detail in the moon. Remember though that with a maximum focal length of 80mm the moon is always going to be quite small in the frame. So you may want to bias your exposure more toward the rest of the scene. My longest lens is a 300mm and that still doesn't result in a big, impressive moon (if that's what you're after).
Jason