The first thing that you have to think about when it comes to 16 mm film is light exposure. This is a fact that is true of still photo film as well as that for moving pictures, though many people forget about that as standard consumer use has been on a video format for the past thirty five years. You can often tell how sensitive to light exposure the film will be by the numeric speed of it. The faster the 16 mm film the less light the film needs to experience a picture. This speed is recognized by the size of the number on the 16 mm film stock. For example, 16 m film with a speed of fifty will take very little light to create a picture and may be able to better handle light exposure to the raw film than that with a higher speed. Usually the ability between speeds to handle open light is going to be relatively minor and all should avoid exposure to direct light. Cool lights, or diffused light sources, are often alright. If loading or changing 16 mm film outside you may want to do it in the shade.