Film speed is determined by which standard?

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Multiple Choice

Film speed is determined by which standard?

Explanation:
Film speed is about how sensitive the film or sensor is to light, and that sensitivity is defined by the ISO standard. ISO numbers tell you how much light is needed to achieve a proper exposure: lower ISO (like 100) means less sensitivity and requires more light, while higher ISO (like 800 or 1600) means more sensitivity and allows shooting in dimmer conditions, though it often adds more grain or noise. Shutter speed controls how long light hits the film or sensor, aperture controls how much light enters the lens, and focal length affects the field of view; none of these set the film’s speed. The standard used to determine film speed is ISO (the system previously known as ASA/DIN in older times).

Film speed is about how sensitive the film or sensor is to light, and that sensitivity is defined by the ISO standard. ISO numbers tell you how much light is needed to achieve a proper exposure: lower ISO (like 100) means less sensitivity and requires more light, while higher ISO (like 800 or 1600) means more sensitivity and allows shooting in dimmer conditions, though it often adds more grain or noise. Shutter speed controls how long light hits the film or sensor, aperture controls how much light enters the lens, and focal length affects the field of view; none of these set the film’s speed. The standard used to determine film speed is ISO (the system previously known as ASA/DIN in older times).

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