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Film is able to record images because it is sensitive to light. This sensitivity is
expressed as an ISO film “speed” number. The higher the number, the “faster” the film. Faster film requires less light to take a picture.
Slower films in the ISO 100 range are fine for outdoor use in sunlight. But for
maximum all-around versatility-fast action, low light outdoors, and indoor photography-we recommend ISO 400-1600 film.
In the past, higher sensitivity was often characterized by larger grain that detracted from the quality of the picture. Now, however, high-quality high-speed film and sophisticated digital cameras make it possible to take advantage of high sensitivity without sacrificing crisp detail and vivid colors. |
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When shooting without a flash in dim light, slow shutter speed makes it difficult to avoid camera shake and subject motion blurring. Boosting ISO sensitivity minimizes the blurs. |
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Boosting ISO sensitivity is also effective for shooting in low light conditions. A higher ISO setting enables you to capture your subject as it appears, without the unnatural illumination of a flash. |
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Increasing ISO sensitivity can also increase the depth of field (the range of acceptable focus). As seen in the photos here, the boy at the back of line is out of focus when shot at ISO 100. But when sensitivity is boosted to ISO 1600, the focus range expands so that all the children are in focus. |
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