Lens and method of calibration

The invention relates to a lens comprising a housing (12) into the interior thereof or a plurality of adjustable optical elements are arranged on the exterior thereof a setting screen (18, 20) having a pair of marks of two relatively movable pair of units, namely a scale (181, 201) and a reference mark (180, 202) is disposed, whose relative position is representative of at least one resulting from the current setting of the optical elements or optical property of the lens (10). It is characterized in that the setting display (18, 20) an electronic display (184, 204), on which at least one of the pair of units (180, 181; 201, 202) is displayed, wherein the display position on the display (184 , 204) set stored in accordance with an output coupled in a (with the display 184, 204) storage unit of dependency rules is dependent on the current setting of the or of the optical elements.