ISOAD is an advanced shooting mode suitable for D-SLR users.
Instead of simply increasing ISO to increase sensitivity when a long exposure is not suitable, ISOAD automatically calculates the optimal ISO value for every pixel in the image, within a predefined range.
Using high ISO captures dark details but leads to increase in global noise and blow-out of highlights.
Instead of ISO 1600, use ISOAD 1600: the camera calculates the optimal ISO value for each pixel of the image, up to a maximum value of 1600.
The result is a dramatic increase in the effective dynamic range of your images.