I don't know exactly how ISO works within a digital camera, but from a video I saw, it described it as the camera essentially brightening the image from the sensor, given the same amount of light from the shutter/aperture.
If that is so, I don't see why a camera couldn't record two or more ISO's at the same time and record them as different images. Why is this not possible? Is changing the ISO sensitivity more tied to the mechanics of the sensor/camera so this is not possible? Or is it possible but just not done because there is no good reason to implement it?
I'm asking because if this is possible, it would make ISO variable HDR photos a lot easier with no ghosting and open up possibilities in many cases where it is not used right now (fast moving objects).
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