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Film speed is a measurement of how sensitive the film is to light. The longer it takes the camera to collect light onto the film, the longer it takes the camera to take the picture. So, the lower the speed of the film, the longer it takes your camera to take the picture. On the other hand, the lower the speed of film, the more light you will have in your photo. To find the speed of film, on the package of film it will say a number followed by ASA or ISO to indicate the film's speed. For example, the package may say 200 ISO or 200 ASA. With that in mind, here is how to choose the right speed to take the best pictures of your kids.