Patent ID: 8031257

Claim:
A zoom lens control apparatus that, when zooming, moves a first lens for zooming and a second lens for focusing positioned behind the first lens on the optical axis of the first lens with respect to a photographic subject in an optical axis direction, the apparatus comprising: an image sensing unit that converts an optical image of the photographic subject entering through the first lens and the second lens into image data; a calculation unit that calculates a focus evaluation value that indicates a state of focus based on the image data from the image sensing unit, the focus evaluation value reaching a peak at a position where the state of focus is an in-focus state; and a focusing controller that carries out focusing control based on the peak by moving the second lens so that a focal plane moves at a first speed until the focus evaluation value calculated by the calculation unit reaches the peak, and carries out focusing control by moving the first lens and the second lens so that the focal plane moves at a second speed which is slower than the first speed after the focus evaluation value calculated by the calculation unit has passed the peak.