Time to be with your loved ones

Time to be with loved ones

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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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Does a deeper photosite increase the dynamic range?

As I understand, a bigger photosite (on the sensor) enables a bigger dynamic range and also better high ISO performance. Is there a reason not to make the photosite deeper?