Camera system

Abstract

To improve user-friendliness when checking the depth of field, in a camera system having an aperture value alteration function. A camera system ( 100 ) has an imaging optical system (L), an imaging unit ( 45 ), an aperture adjustment unit ( 29 ), a liquid crystal display monitor ( 16 ), and an AGC unit ( 59 ) of an analog signal processing unit ( 51 ). The imaging optical system (L) forms an optical image of a subject. The imaging unit ( 45 ) converts the optical image into an image signal, and obtains an image of the subject. The aperture adjustment unit ( 29 ) can adjust the aperture value of the imaging optical system. The liquid crystal display monitor ( 16 ) displays the image. The AGC unit ( 59 ) adjusts the brightness of the image displayed on the liquid crystal display monitor ( 16 ) according to the aperture value.

1 . A camera system for photographing a subject, the camera system comprising:
 an imaging optical system configured to form an optical image of the subject;   an imaging unit configured to convert the optical image into an image signal, and obtaining an image of the subject;   a movable reflecting mirror arranged between the imaging optical system and the imaging unit;   an observation optical system through which a light reflected by the reflecting mirror is observed;   a reflecting mirror drive unit configured to drive the reflecting mirror;   an aperture adjustment unit which can adjust an aperture value of the imaging optical system;   a display unit configured to display the image;   an image adjustment unit configured to adjust the brightness of the image displayed on the display unit according to the aperture value; and   a preview operation unit configured to be operated, wherein   based on operating the preview operation unit, the aperture adjustment unit changes an aperture value of the imaging optical system to a set aperture value, the reflecting mirror drive unit drives the reflecting mirror outside an optical path formed between the imaging optical system and the image pickup device, and the display unit displays the image obtained by the imaging unit.   
     
     
         2 . The camera system according to  claim 1 , wherein
 when the image is displayed on the display unit based on operating the preview operation unit, the image adjustment unit amplifies the image signal according to the aperture value.   
     
     
         3 . The camera system according to  claim 2 , wherein
 the image adjustment unit amplifies the image signal based on information on the relationship between the aperture value and the amplification factor of the image signal.   
     
     
         4 . The camera system according to  claim 2 , further comprising an aperture value input unit to which the aperture value can be input,
 wherein, the display unit configured to display a standard image obtained with a standard aperture value set in advance, and a comparative image obtained with a set aperture value set in the aperture value input unit, side by side, based on operating the preview operation unit.   
     
     
         5 . The camera system according to  claim 4 , further comprising:
 an operation unit to which information can be input from the outside; and   an image recording unit for recording the image,   wherein, the standard image and comparative image are recorded in the image recording unit based on information inputted from the operation unit.   
     
     
         6 . The camera system according to  claim 1 , wherein
 the image displayed on the display unit based on operating the preview operation unit is a real-time image.   
     
     
         7 . The camera system according to  claim 4 , wherein
 when the aperture value for obtaining the standard image differs from the aperture value for obtaining the comparative image, the image adjustment unit sets the amplification factor for an image signal of the standard image and the amplification factor for an image signal of the comparative image to be different from each other.