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What is the difference between 100, 200, 400, & 800 ISO/Film speeds?

Question:
What is the difference between 100, 200, 400, & 800 ISO/Film speeds?

Answer:

*Fuji 100 ISO Film is generally used for brightly-lit subjects, outdoors, and electronic flash photography.
*Fuji 200 ISO Film is generally an all-around type film for still photos or better flash distance compared to 100 ISO.
*Fuji X-TRA 400 ISO Film is suitable for daylight, twilight, and indoor shooting and for candid snapshots and sports action, available light or flash.
*New Superia X-TRA 800 ISO Film is ideal for sports and low light photography without flash, and extends the flash distance compared to slower speeds.