The grain can be associated to low light and your camera not being able to handle low light, whether it is film (film grain) or digital (digital noise). In film, if you use too low of a ISO or film speed you will see grain, try using a 800 speed film if you are getting alot of night pics, or try using another brand of film. 100-400 iso film is used in bright light (100 iso being a faster film) to moderate light with or without flash and 400 - 1600 for low light to no light (slower speed films) I use strictly 400 speed film in my game cams as at night the flash will help expose the shot with a medium speed film. If you are not used to ISO settings and film speeds it can be confusing, so I hope I did not confuse you more.