different aspect ration for image or page slider pictures in mobile mode

The ideal aspect ratio for the Featured Image/Page Slider is 2,33 (1680:720) right? Off course this aspect ratio is perfect for destop mode. But if i'm using a smartphone in portrait mode, it would be nice if it would scale to an aspect ratio with more less width and/or bigger height (e.g. 16:9), so that the picture fills more space of the screen. Is this possible?