ISO is the number indicating a digital camera sensors sensitivity to light. The higher the sensitivity, the less light is needed to make an exposure. Digital cameras automatically select the ISO but most have a setting to change it manually.
Example Number of ISO:-
0, 12, 25, 32, 50, 64, 100, 125, 200, 400, 800, 1000, 1600, 3200, 6400, 12000, 25000
Note:- The higher the number, the more noise. The amount and degree of noise varies from camera to camera.
Standard;-
ISO - International Standard Association.
ASA - American Standard Association.
DIN - Deutsche Industrie Norme
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