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A technique where several pictures are exposed on one frame of film. This can be used for special effects such as shooting the same person so they appear twice in the same photo. Its also useful for shooting, say, a photo of the moon using a long lens and taking a second shot of a landscape with a wide angle. The two combined will look surreal. You normally have to do this manually and on cameras with automatic film advance it can be very tricky to achieve. Fortunately some cameras have an automatic multiple exposure mode.
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A flash technique where you fire the flash several times to increase the exposure allowing a smaller aperture to be selected. It can also be used for special effects; the most common being strobe like effect, following the swing of a golfer or the flapping wings of a nocturnal bird. It can also be used to light the same subject in several positions in the frame - to allow a multiple exposure effect.
A camera mode that allows two or more pictures to be taken on the same part of the film. Digital photography allows this to be achieved much easier and far more acuratley so it's less important to have nowadays.