Transcription: Shutter speed indicates the amount of time film is exposed to light coming from the lens. On most cameras, shutter speeds are indicated by whole numbers like 30, 60 or 250. However, the amount of time the film is exposed to light is actually 1 30th, 1 60th or 1 250th of a second. Therefore, larger numbers are faster shutter speeds indicating that the shutter is open for a shorter time.