1. A camera system ( 10 ) for detecting a stream of objects ( 14 ) moved relative to the camera system ( 10 ), the camera system ( 10 ) comprising a plurality of detection units ( 18 ) each having an image sensor and a focusing unit ( 20 ); at least one control unit ( 30 , 32 ) to set the focal positions of the detection units ( 18 ) in a complementary manner on a simultaneous detection of a plurality of objects ( 14 ) such that as many objects ( 14 ) as possible are detected in focus by at least one detection unit ( 18 ); and an evaluation unit ( 32 ) which is configured to compose image data of the detection units ( 18 ) to form a common image.