Patent ID: RE43504

Claim:
A focus adjustment apparatus comprising: a focus adjustment device that drives a focus lens of an image sensing optical system to adjust a focal point of the image sensing optical system in response to a manual focusing operation by a user; of a user; a change device that controls said focus focusing adjustment device to decrease a focus adjustment drive speed of the focus lens caused by the manual focusing operation by the user as a photoelectric conversion cycle in which an image sensing device converts an object image received via the image sensing optical system into an image signal becomes longer drive the focus lens in a first speed in response to the manual focusing operation of the user when a photoelectric conversion cycle in which an image sensing device photo-electrically converts an object image is a first cycle, and drive the focus lens in a second speed in response to the manual focusing operation of the user when the photoelectric conversion cycle is a second cycle, wherein the first speed is slower than the second speed and the fire cycle is longer than the second cycle ; and a display device that displays images corresponding to electric signals which are periodically and photo-electrically converted by the image sensing device.