Patent ID: 7126098

Claim:
A taking lens, comprising: a picture-taking optical system which allows object light to enter an image-capturing element for picture-taking of a camera, the picture taking optical system including a first optical path and a first relay lens in the first optical path movable along a first optical axis and forming an image of the object light on an image-capturing plane of the image-capturing element; a light-splitting device in the first optical path on the opposite side of the first relay lens from the image-capturing element splitting a portion of object light to a second optical path different than the first optical path; a focus determination optical system in the second optical path including a focus status determination image-capturing element and a second relay lens movable along a second optical axis different than the first optical axis and forming an image of the object light on an image-capturing plane of the focus status detecting image-capturing element; a picture-taking optical length adjusting device which adjusts an optical length of the picture-taking optical system by moving the first relay lens along the first optical path; and a focus determination optical length adjusting device which adjusts an optical length of the focus detennination optical system by moving the second relay lens along the second optical path, wherein a plurality of focus status determination image-capturing elements, each having a different optical length, are provided in the focus determination optical length adjusting device.