Re: Raoul is right
Raoul is exactly right. Exposure time and film type is critical when trying to shoot a comets tail. To long of an exposure can result in a shorter and less detail of the tail for example. You can take a shot on the same night of the same object with the same camera with the same film at the same exposure time and at the same camera settings and have different results of the image do to changes in atmospheric conditions alone.
SteveS