Lens apparatus and image pickup apparatus including the same

Abstract

Provided is a lens apparatus, including: a focus lens; a focus detector; an automatic focusing unit configured to drive the focus lens based on a focus detection result obtained from the focus detector; a focus information output unit configured to output focus information to a display unit capable of displaying the focus information superimposed on a picked up image obtained by picking up an image with use of a light beam from an object, which passes through the lens apparatus; and a display determination unit configured to determine whether or not to display the focus information on the display unit, in which the focus information output unit is configured to output a signal for displaying the focus information to the display unit based on a determination result obtained from the display determination unit.

1 . A lens apparatus, comprising:
 a focus lens;   a focus detector;   an automatic focusing unit configured to drive the focus lens based on a focus detection result obtained from the focus detector;   a focus information output unit configured to output focus information to a display unit capable of displaying the focus information superimposed on a picked up image obtained by picking up an image with use of a light beam from an object, which passes through the lens apparatus; and   a display determination unit configured to determine whether or not to display the focus information on the display unit,   wherein the focus information output unit is configured to output a signal for displaying the focus information to the display unit based on a determination result obtained from the display determination unit.   
     
     
         2 . A lens apparatus according to  claim 1 ,
 wherein the display determination unit is configured to determine whether or not to display the focus information on the display unit, based on at least one determination condition, and   wherein the lens apparatus further comprises a condition setting unit configured to set the at least one determination condition effective and ineffective.   
     
     
         3 . A lens apparatus according to  claim 2 , wherein the at least one determination condition comprises at least one of a condition whether or not the object is in focus, a condition whether or not the automatic focusing unit is operated, and a condition whether or not a predetermined time period has elapsed. 
     
     
         4 . A lens apparatus according to  claim 2 , further comprising a zoom lens,
 wherein the at least one determination condition comprises a condition whether or not a focal length of the lens apparatus is changed.   
     
     
         5 . A lens apparatus according to  claim 2 , further comprising an extender mechanism,
 wherein the at least one determination condition comprises a condition whether or not an extender lens positioned on an optical path is changed.   
     
     
         6 . A lens apparatus according to  claim 2 , further comprising a unit configured to allow the lens apparatus to perform a pan movement and a tilt movement,
 wherein the at least one determination condition comprises at least one of a condition whether or not the pan movement is performed and a condition whether or not the tilt movement is performed.   
     
     
         7 . A lens apparatus according to  claim 2 , wherein the condition setting unit is configured to display the at least one determination condition. 
     
     
         8 . An image pickup apparatus, comprising:
 a lens apparatus comprising:
 a focus lens; 
 a focus detector; and 
 an automatic focusing unit configured to drive the focus lens based on a focus detection result obtained from the focus detector; 
   an operation apparatus configured to operate the lens apparatus;   a camera apparatus removably connected to the lens apparatus, the camera apparatus comprising:
 an image pickup unit configured to pick up an object image with use of a light beam from an object, which passes through the lens apparatus; and 
 a display unit capable of displaying focus information superimposed on a picked up image obtained by the image pickup unit; 
   a focus information output unit configured to output the focus information to the display unit; and   a display determination unit configured to determine whether or not to display the focus information on the display unit,   wherein the focus information output unit is configured to output a signal for displaying the focus information to the display unit based on a determination result obtained from the display determination unit.   
     
     
         9 . An image pickup apparatus according to  claim 8 ,
 wherein the operation apparatus comprises a display mode setting unit configured to select one of a setting which constantly displays the focus information on the display unit, a setting which constantly hides the focus information and a setting which displays the focus information on the display unit in accordance with a condition, and   wherein the display determination unit of the lens apparatus functions only when the display mode setting unit selects the setting of “display in accordance with a condition.”   
     
     
         10 . An image pickup apparatus according to  claim 8 ,
 wherein the camera apparatus further comprises a luminance detector configured to detect luminance of the picked up image in an focus detection range, and   wherein the display determination unit is configured to determine whether or not to display the focus information on the display unit, based on at least one determination condition, and   wherein the at least one determination condition comprises at least one of a condition whether or not an aspect ratio of the camera apparatus is changed and a condition whether or not information on the luminance detected by the luminance detector is changed.