Optical system comprising a probe for image sensor detection

A method for positioning of a lens group relative to an image sensor, comprising:

• moving at least one lens and a probe fixed in relation to the at least one lens along an axis towards an image sensor, the probe is moved out through an opening of a lens housing accommodating the at least one lens and the probe;
• detecting that a motion of the at least one lens and the probe is prevented by that the probe hits a surface of the image sensor;
• concluding that the position of the image sensor is found;
• and
• moving the at least one lens relative to the found position for achieving a desired imaging setting according to a predetermined distance between the at least one lens and the image sensor.

A control unit configured to control an actuating system for moving a lens group relative to an image sensor, the control unit being configured to

• move at least one lens and a probe fixed in relation to the at least one lens along an axis towards an image sensor, the probe being moved out through an opening of a lens housing accommodating the at least one lens and the probe;
• detect that a motion of the at least one lens and the probe is prevented because the probe hits a surface of the image sensor;
• conclude that a position of the image sensor is found;
• and
• move the at least one lens relative to the found position for achieving a desired imaging setting according to a predetermined distance between the at least one lens and the image sensor.