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This post is in response to a comment from Sue at The View From Great Island after Photo Tip #2, about depth of field. She asked for more info on ISO.
A film’s light sensitivity was known as it’s “speed.” “Fast” film–rated at ASA 1600–was more light sensitive than “slow” ASA 64 or even superslow ASA 25 film.
It was what it was. To change film speed you had to change film. And that could get expensive in a hurry.
Simply put, a lower ISO is less light sensitive…a higher ISO is more sensitive.
Which means when there’s less light, you may want to shoot with a higher ISO.
It will all make a lot more sense then when we look at the big picture. HA! Yes. Pun intended.
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