I'm wondering what would be a good minimum shutter speed for the GA645 Fuji camera. I recently got back some film and found many super soft images, with nothing much in good focus. I think I might be too liberal with what shutter speeds I can get away with, with this camera. It's got a 65 mm lens and I go well under 1/60 sec in shutter speeds. At what speed should I try to maintain to make certain that camera shake is not really probable?

Thanks!