Eye of the eclipse...

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ISO is the sensitivity of the camera's sensor or film; high ISO is more sensitive and often required in low-light situations, where there is a large correlation with noise.

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meaning of ISO setting on Sony alpha 6000

Under the premise that the 14-bit A-D converter has approximately the range needed to quantize every single photon (<25000 full well capacity, 16K possible values) for low-light shooting raising ...