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This film container denotes its speed as ISO 100/21°, including both arithmetic (100 ASA) and logarithmic (21 DIN) components. The second is often dropped, making (e.g.) "ISO 100" effectively equivalent to the older ASA speed. (As is common, the "100" in the film name alludes to its ISO rating.)

フィルム感度（ISO）の仕組みと歴史アナログからデジタルまで

フィルム感度ISOASADIN
2026年8月13日続きを読む →