Cameras, ContinuedFilm speedFilm speed appears on every roll of film and is an industry-rated standard.The standard is set by the International Standards Organization (ISO). Filmspeed, sometimes referred to as film sensitivity, indicates the sensitivity ofthe film emulsion to record latent images of light. Film speed may be fast orslow. Selection of a film speed requires a knowledge of film characteristics,lighting situations, and potential compromises.FAST FILM: Film considered “fast” is film that requires less light forexposure. These are the low-light film speeds of ISO 400 and higher. Imageresolution is good in small prints; however, pronounced graininess appears inenlargements. Some of the very fast films, ISO 1000 and faster, need verylittle light and an extremely short exposure time, making them more desirablefor dimly lit auditoriums and difficult to handle in daylight situations.SLOW FILM: Slow film requires more light or longer exposure times torecord an image. Slow films, such as ISO 25, have very fine grain thatremains fine even in enlargements. These films are ideal for a controlledstudio atmosphere.SlideSometimes a photo lab is not available to produce duplicates of slides orduplicatorstransparencies. The DM is able to duplicate slides using a slide duplicatorthat attaches to the front of a camera body much as a lens does. Theduplication process allows the DM an opportunity to correct minor exposureerrors and perform limited cropping of the original slide. The light meter inthe camera can meter exposure. Transparencies, placed on a light table orthe illuminated copyboard of a process camera, can be re-photographed witha 35mm camera and slide film.4-42
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