Abstract: The present invention relates to the correction of planar focus in an electronic still or video camera. The camera includes: a detector array an objective lens arranged to direct optical radiation from an object plane onto the detector the lens defining an optical axis of the camera and the object plane being at an oblique angle to the optical axis movement device to change the relative orientation of the detector with respect to the lens so that the detector and lens may be moved relatively toward or away from each other along the optical axis and also tilted with respect to each other with at least one degree of freedom and focus detection device connected to the detector to detect when a portion of an image falling on the detector is in focus.