1. A device for stereophotogrammetry comprising a camera body ( 1 ) and a double-optics ( 2 ) comprising two sub-optics ( 2 b ) and ( 2 c ), configured for a simultaneous acquisition of two views according to two different angles, wherein the device is comprising a positioning system ( 34 ) configured to signal when a target subject (S) is reaching a pre-defined distance position to the camera ( 1 ) corresponding to one of at least two distinct pre-defined distance positions (A 3 , A 4 ) of the target subject (S) relative to the camera body ( 1 ) of the stereophotogrammetry device, the at least two distinct predefined distance positions comprising a closer distance position (A 4 ) and a farther distance position (A 3 ), the closer distance position (A 4 ) being closer to the camera body ( 1 ) of the stereophotogrammetry device than the farther distance position (A 3 ) to the camera body ( 1 ) of the stereophotogrammetry device.