An apparatus for adjusting and/or calibrating a multi-camera module having a plurality of cameras (4a, 4b), the apparatus comprising: - an optical arrangement, which is configured to simultaneously create first virtual test structures at an infinite distance and second virtual test structures at a finite distance, wherein the optical arrangement comprises one single collimator (12, 36), - wherein a) the collimator (12, 36) is a bifocal collimator, which images a single graticule as the first virtual test structures at an infinite distance and images the graticule as second virtual test structures at a finite distance or b) a first graticule and a second graticule are arranged at different distances from a focus of the collimator, in that the first virtual test structures and the second virtual test structures can be created by the collimator, - and wherein the first and the second virtual test structures (22, 26) are simultaneously detectable with the cameras (4a, 4b) of the multi-camera module, - a processing unit for evaluating a picture of the first and second virtual test structures (22, 26) captured with the multi-camera module, wherein the processing unit is configured to calculate an alignment of the cameras (4a, 4b) of the multi-camera module relative to each other from the captured picture, wherein the picture captured with the multi-camera module comprises an individual image (20a, 20b) per camera (4a, 4b), and wherein each individual image (20a, 20b) displays the first and the second test virtual structures (22, 26) and the processing unit is further configured to calculate an alignment of the cameras (4a, 4b) relative to each other, in that positions of the test structures (22, 26) in the individual image (20a, 20b) of a camera (4a, 4b) are compared with positions of the corresponding test structures (22, 26) in the individual image (20a, 20b) of a further camera (4a, 4b) and deviations are calculated, - an adjusting and/or calibrating unit, which is configured to align said cameras (4a, 4b) relative to each other based on data relating to the alignment of the cameras (4a, 4b) of the multi-camera module and thereby adjusting and/or calibrating the multi-camera module. - an optical arrangement, which is configured to simultaneously create first virtual test structures at an infinite distance and second virtual test structures at a finite distance, wherein the optical arrangement comprises one single collimator (12, 36), - wherein a) the collimator (12, 36) is a bifocal collimator, which images a single graticule as the first virtual test structures at an infinite distance and images the graticule as second virtual test structures at a finite distance or b) a first graticule and a second graticule are arranged at different distances from a focus of the collimator, in that the first virtual test structures and the second virtual test structures can be created by the collimator, a) the collimator (12, 36) is a bifocal collimator, which images a single graticule as the first virtual test structures at an infinite distance and images the graticule as second virtual test structures at a finite distance or b) a first graticule and a second graticule are arranged at different distances from a focus of the collimator, in that the first virtual test structures and the second virtual test structures can be created by the collimator, - and wherein the first and the second virtual test structures (22, 26) are simultaneously detectable with the cameras (4a, 4b) of the multi-camera module, - a processing unit for evaluating a picture of the first and second virtual test structures (22, 26) captured with the multi-camera module, wherein the processing unit is configured to calculate an alignment of the cameras (4a, 4b) of the multi-camera module relative to each other from the captured picture, wherein the picture captured with the multi-camera module comprises an individual image (20a, 20b) per camera (4a, 4b), and wherein each individual image (20a, 20b) displays the first and the second test virtual structures (22, 26) and the processing unit is further configured to calculate an alignment of the cameras (4a, 4b) relative to each other, in that positions of the test structures (22, 26) in the individual image (20a, 20b) of a camera (4a, 4b) are compared with positions of the corresponding test structures (22, 26) in the individual image (20a, 20b) of a further camera (4a, 4b) and deviations are calculated, - an adjusting and/or calibrating unit, which is configured to align said cameras (4a, 4b) relative to each other based on data relating to the alignment of the cameras (4a, 4b) of the multi-camera module and thereby adjusting and/or calibrating the multi-camera module.