Quote: Yes - but what does it take as the "current ISO"? That from the last shot taken, or something else, because if the scene is dark enough to use flash, it ought to be bumping the ISO up to 800 or more, yet clearly it doesn't do this
As I understand it with Auto ISO the ISO is set to the lowest setting which allow the indicated aperture/shutter ratio to be used. In each mode there is normally a default shutter/aperture combo which I presume take precedence over the ISO setting. The 'current ISO' should therefore be the one which is required to achieve the indicated S/A combination - be that the program default or a personal selection - according to the ambient light being metered.
Of course if the ISO is already at maximum (manually pre-set or absolute) then it can't be adjusted upwards...