A device (10; 20; 30) comprising: a housing having a first transparent area and a second transparent area; a multi-aperture imaging device (16; 16a-b) arranged inside the housing and including beam-deflecting means; a first diaphragm and a second diaphragm; the portable device (10; 20) having a first operating state and a second operating state; wherein in the first operating state, the beam-deflecting means deflects an optical path of the multi-aperture imaging device (16; 16a-b) such that it passes through the first transparent area and that the second diaphragm at least partly optically closes the second transparent area, thereby setting a first viewing direction toward a first total field of view for the device; and wherein in the second operating state, the beam-deflecting means deflects the optical path of the multi-aperture imaging device (16; 16a-b) such that it passes through the second transparent area and that the first diaphragm at least partly optically closes the first transparent area, thereby setting a second viewing direction toward a second total field of view for the device; wherein switching between the first operating state and the second operating state is based on a rotational movement of the deflecting means; wherein optical channels of the multi-aperture imaging device are directed by the beam-deflecting means on the basis of a set viewing direction toward either the first total field of view or the second total field of view and have angles in relation to one another within the set viewing direction, so that the optical channels are directed into partial fields of view of the respective total field of view which, at the most, only partly overlap; and wherein optical channels each comprise one or several optics for changing an optical path of the imaging device and an image sensor area and are deflected by the beam-deflecting means in the direction towards the set viewing direction. a housing having a first transparent area and a second transparent area; a multi-aperture imaging device (16; 16a-b) arranged inside the housing and including beam-deflecting means; a first diaphragm and a second diaphragm; the portable device (10; 20) having a first operating state and a second operating state; wherein in the first operating state, the beam-deflecting means deflects an optical path of the multi-aperture imaging device (16; 16a-b) such that it passes through the first transparent area and that the second diaphragm at least partly optically closes the second transparent area, thereby setting a first viewing direction toward a first total field of view for the device; and wherein in the second operating state, the beam-deflecting means deflects the optical path of the multi-aperture imaging device (16; 16a-b) such that it passes through the second transparent area and that the first diaphragm at least partly optically closes the first transparent area, thereby setting a second viewing direction toward a second total field of view for the device; wherein switching between the first operating state and the second operating state is based on a rotational movement of the deflecting means; wherein optical channels of the multi-aperture imaging device are directed by the beam-deflecting means on the basis of a set viewing direction toward either the first total field of view or the second total field of view and have angles in relation to one another within the set viewing direction, so that the optical channels are directed into partial fields of view of the respective total field of view which, at the most, only partly overlap; and wherein optical channels each comprise one or several optics for changing an optical path of the imaging device and an image sensor area and are deflected by the beam-deflecting means in the direction towards the set viewing direction.