Film speed refers to the sensitivity of film to light, indicating how quickly it can capture images. It is measured using ISO or ASA numbers. Higher film speeds, such as ISO 800, are more sensitive and better for low-light conditions, while lower speeds, like ISO 100, are less sensitive but produce finer detail and less grain in well-lit situations. Film speed helps photographers select the appropriate film for their shooting environment.

英語での「film speed」の定義と意味

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