Film speed refers to the sensitivity of photographic film to light, which determines how much light is needed to produce a proper exposure. It is usually measured using the ISO (International Standards Organization) scale, which quantifies a film's sensitivity to light. The higher the ISO number, the more sensitive the film is, allowing it to capture images in lower light conditions. For example: - ISO 100 is less sensitive and typically used in bright light conditions, producing fine grain and high detail.
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