Patent ID: 7884878

Claim:
A lens apparatus mountable on a camera apparatus, comprising: an imaging optical system including a focus lens unit; a first generating unit configured to generate a first sharpness evaluation value from a video signal output from the camera apparatus corresponding to an output signal from an imaging unit configured to photoelectrically convert an object image formed by the imaging optical system, the video signal including scanning lines that carry superimposed information which reduces an amount of variation of the first sharpness evaluation value for those scanning lines, the video signal also including scanning lines that do not carry such superimposed information; a second generating unit configured to generate a second sharpness evaluation value using the first sharpness evaluation value; and a control unit configured to control a focus adjusting operation of the imaging optical system based on the first sharpness evaluation value or the second sharpness evaluation value, wherein the lens apparatus is configured to determine whether the amount of variation of the first sharpness evaluation value when the focus lens unit is moved for each scanning line is equal to or greater than a predetermined amount, and to generate the second sharpness evaluation value, not using the first sharpness evaluation value of a scanning line when the amount of variation is less than the predetermined amount, but using the first sharpness evaluation value of a scanning line when the amount of variation is equal to or greater than the predetermined amount, and to drive the focus lens unit to the in-focus position, using the second sharpness evaluation value.