Lens apparatus and image pickup apparatus
Provided is a lens apparatus including: an optical system including: an optical system including a plurality of lenses; a tilting unit configured to change an angle of an object plane to an optical axis about with respect to an axis of rotation as a center by displacing at least a part some of the plurality of lenses; an aperture stop having configured to change an aperture amount which is changeable; an aperture stop driving unit configured to drive the aperture stop to change the aperture amount by driving the aperture stop; an in-focus information obtaining unit configured to obtain a first in-focus information of a first object which is displaced from the axis of rotation; and a control unit configured to control the aperture stop driving unit based on the first in-focus information and a drive information of the tilting unit.
1 . A lens apparatus connectable to a camera body, the lens apparatus comprising:
an optical system including a plurality of lenses;
a tilting unit configured to change an angle of an object plane to an optical axis about an axis of rotation by displacing at least one of the plurality of lenses;
an aperture stop configured to change an aperture diameter;
an aperture stop driving unit configured to drive the aperture stop to change the aperture diameter;
an obtaining unit configured to obtain, from the camera body, a first in-focus information of a first object which is displaced from the axis of rotation; and
a control unit configured to control the aperture stop driving unit according to a change in an in-focus degree of the first object based on the first in-focus information and during driving of the tilting unit when the tilting unit is driven to reach a terminal end.
2 . The lens apparatus according to claim 1 , wherein, when the in-focus degree of the first object during the driving of the tilting unit is increased, the control unit is configured to control the aperture stop driving unit so as to decrease the aperture diameter of the aperture stop.
3 . The lens apparatus according to claim 1 , wherein, when the in-focus degree of the first object during the driving of the tilting unit is increased, the control unit is configured to obtain a first aperture diameter of the aperture stop for bringing the first object into an in-focus range, and controls the aperture stop driving unit so as to cause the aperture stop to attain the first aperture diameter.
4 . The lens apparatus according to claim 3 , wherein the control unit is configured to output an alarm when the in-focus degree of the first object during the driving of the tilting unit has been increased, and the first object is not allowed to be brought into the in-focus range by stopping down the aperture stop.
5 . The lens apparatus according to claim 1 , wherein, when the in-focus degree of the first object during the driving of the tilting unit is decreased, the control unit is configured to control the aperture stop driving unit so as to increase the aperture diameter of the aperture stop.
6 . The lens apparatus according to claim 1 ,
wherein the plurality of lenses includes a focus lens configured to be moved for focusing, and
wherein the lens apparatus further comprises a focus control unit configured to control driving of the focus lens so as to bring a second object on the axis of rotation into an in-focus condition.
7 . The lens apparatus according to claim 1 , further comprising a tilt driving unit configured to drive the tilting unit,
wherein the obtaining unit is configured to obtain a second in-focus information of a second object existing on the axis of rotation, and
wherein the control unit is configured to obtain, based on the first in-focus information and the second in-focus information, a second tilting amount and a second aperture diameter of the aperture stop for bringing the first object and the second object into in-focus conditions, control the tilt driving unit so as to attain the second tilting amount, and control the aperture stop driving unit so as to cause the aperture stop to attain the second aperture diameter.
8 . The lens apparatus according to claim 7 , wherein the control unit is configured to control the tilt driving unit by setting the axis of rotation and a tilting amount so as to cause the first object to be in the object plane.
9 . The lens apparatus according to claim 7 , wherein the control unit is configured to set an axis of rotation and a tilting amount at which the first object is nearest to an object plane and to control the aperture stop driving unit so as to bring the first object into an in-focus range at the axis of rotation and the tilting amount.
10 . The lens apparatus according to claim 7 , wherein the second in-focus information is obtained under a state in which the aperture diameter is a predetermined value other than a maximum value.
11 . The lens apparatus according to claim 7 , wherein the control unit is configured to output an alarm when it is not possible to obtain, based on the first in-focus information and the second in-focus information, a tilting amount and an aperture diameter of the aperture stop for bringing the first object and the second object into the in-focus conditions.
12 . The lens apparatus according to claim 1 , wherein the first in-focus information is obtained under a state in which the aperture diameter is a predetermined value other than a maximum value.
13 . An image pickup apparatus comprising:
a lens apparatus according to claim 1 ;
and
a camera apparatus including an image pickup element configured to pick up an image formed by the lens apparatus.
14 . The image pickup apparatus according to claim 13 , wherein the camera apparatus includes a camera controlling unit configured to control at least one of a shutter speed or an ISO sensitivity based on a change in an aperture diameter of the aperture stop.