An automatic camera head for panning and tilting a video camera, comprising a base, an intermediate element connected to said base and rotatable relative to said base about a pan rotation axis, a camera holder connected to said intermediate element and rotatable relative to said intermediate element about a tilt rotation axis orthogonal to the pan rotation axis, a pan actuator arranged to turn the intermediate element about the pan rotation axis, a tilt actuator arranged to turn the camera holder about the tilt rotation axis, wherein the pan actuator and/or the tilt actuator include DC brushless motors driving the intermediate element respectively the camera holder directly, or via a strain-wave reduction gear, characterised in that the automatic camera head further comprises at least one zoom ring actuator arranged to act on a zoom control of an objective of the camera, the automatic camera head has a control unit arranged to execute a calibration process and to determine a map between a setting of the zoom control and the field of view of the objective with the steps of: - moving the zoom control by the zoom ring actuator; - determining limit angles in the zoom control; - determining a field of view of the objective at a plurality of positions of the zoom control, and in that determining the field of view of the objective includes: - taking at least a first image and a second image of a scene by the camera at different pan and/or tilt angles: - identifying and pairing key features in the first and second images, - determining the field of view based on the separation of paired key features in the first and second images. the automatic camera head further comprises at least one zoom ring actuator arranged to act on a zoom control of an objective of the camera, the automatic camera head has a control unit arranged to execute a calibration process and to determine a map between a setting of the zoom control and the field of view of the objective with the steps of: - moving the zoom control by the zoom ring actuator; - determining limit angles in the zoom control; - determining a field of view of the objective at a plurality of positions of the zoom control, and in that - moving the zoom control by the zoom ring actuator; - determining limit angles in the zoom control; - determining a field of view of the objective at a plurality of positions of the zoom control, and in that determining the field of view of the objective includes: - taking at least a first image and a second image of a scene by the camera at different pan and/or tilt angles: - identifying and pairing key features in the first and second images, - determining the field of view based on the separation of paired key features in the first and second images. - taking at least a first image and a second image of a scene by the camera at different pan and/or tilt angles: - identifying and pairing key features in the first and second images, - determining the field of view based on the separation of paired key features in the first and second images. - identifying and pairing key features in the first and second images, - determining the field of view based on the separation of paired key features in the first and second images.