Method for calibrating and/or adjusting a lidar system , wherein a measuring comparison with regard to an underlying - one- or two-dimensionally detecting - detector unit involves a distribution of secondary light that is incident from the field of view and imaged on the detector unit and a centre position and/or a width of the distribution being acquired as position data and compared with expected position data comprising an expected centre position and/or an expected distribution, wherein: (i) (a) the lidar system is produced with a transmitter unit and a receiver unit , in particular having supposedly the same viewing angle and/or field of view , and/or (b) each viewing angle of the transmitter unit has an associated, or is assigned a, region of the underlying detector unit by way of the optical image; (ii) the measuring comparison involves a field of view of the receiver unit being compared with the field of view of the transmitter unit , or accordingly corresponding portions of the fields of view of said units being compared with one another, by measurement, (iii) a result of the comparison is taken as a basis for determining a difference variable that is characteristic of a measure of difference between the fields of view of the transmitter unit and the receiver unit or between the relevant portions, and (iv) a value of the difference variable is taken as a basis for determining and providing a correction variable that is characteristic of a measure of a required change in an alignment of at least one of the fields of view of the transmitter unit and the receiver unit or of the relevant portions, - wherein a value of the correction variable is used to change an alignment of at least one of the fields of view of the transmitter unit and the receiver unit or of the relevant portions, and - wherein a distinction is drawn between a useful signal comprising reflected secondary light and background noise by using (i) a threshold value for a signal level and/or (ii) a coincidence filter. (i) (a) the lidar system is produced with a transmitter unit and a receiver unit , in particular having supposedly the same viewing angle and/or field of view , and/or (b) each viewing angle of the transmitter unit has an associated, or is assigned a, region of the underlying detector unit by way of the optical image; (ii) the measuring comparison involves a field of view of the receiver unit being compared with the field of view of the transmitter unit , or accordingly corresponding portions of the fields of view of said units being compared with one another, by measurement, (iii) a result of the comparison is taken as a basis for determining a difference variable that is characteristic of a measure of difference between the fields of view of the transmitter unit and the receiver unit or between the relevant portions, and (iv) a value of the difference variable is taken as a basis for determining and providing a correction variable that is characteristic of a measure of a required change in an alignment of at least one of the fields of view of the transmitter unit and the receiver unit or of the relevant portions, - wherein a value of the correction variable is used to change an alignment of at least one of the fields of view of the transmitter unit and the receiver unit or of the relevant portions, and - wherein a distinction is drawn between a useful signal comprising reflected secondary light and background noise by using (i) a threshold value for a signal level and/or (ii) a coincidence filter. - wherein a value of the correction variable is used to change an alignment of at least one of the fields of view of the transmitter unit and the receiver unit or of the relevant portions, and - wherein a distinction is drawn between a useful signal comprising reflected secondary light and background noise by using (i) a threshold value for a signal level and/or (ii) a coincidence filter. <EOS>