What is the automatic exposure mode of the camera?

The camera has four automatic exposure modes, namely: aperture priority ***A***, speed priority ***S***, program * * * P * * and depth of field

What is the automatic exposure mode of the camera?

The camera has four automatic exposure modes, namely: aperture priority ***A***, speed priority ***S***, program * * * P * * and depth of field priority; They operate in different ways. A single camera combines these four exposure modes and photographers can use them according to different needs. Let me introduce it below, hoping to help everyone!

1.: aperture priority

This exposure mode is practical, and most cameras with automatic exposure function have this mode of automatic exposure function. Before shooting, the photographer must first set the required aperture manually. During the exposure process, the camera's photometric system will measure the brightness of the external scene and automatically reflect it to the camera. The camera automatically controls the shutter speed of the camera for exposure according to the adjusted aperture and the exposure combination measured by photometry. That is, the aperture is manual and the shutter speed is automatic. This mode is convenient for photographers to consider the depth of field effect.

Of course, in the case of automatic speed, we should pay attention to the value of shutter speed, whether the handheld camera can be stable and whether the clarity of the picture can be guaranteed.

2.:. Speed first

This automatic exposure mode is manual shutter speed and automatic aperture. Before shooting, the photographer needs to manually adjust the required shutter speed. During exposure, the camera's photometric system measures the brightness of the external scene, and then automatically controls the aperture of the camera lens for exposure according to the combination of the adjusted shutter speed and the exposure measured by photometry. This mode has the initiative to choose the shutter speed, which is beneficial to grasp the performance of the moving body.

3 ..: Formula

The aperture and shutter speed of programmed automatic exposure are automatically adjusted by the camera. The adjustment of aperture and shutter speed is determined according to the brightness of the external scene and the program stored in the camera.

The exposure reference program is stored in the camera with programmed automatic exposure. During exposure, the photometric system measures the brightness value of the external scene, compares the exposure combination of aperture and shutter that should be used in the program, and controls the aperture and shutter of the camera, thus realizing automatic exposure.

Program exposure simplifies the exposure operation during shooting and brings convenience to photographers, but it makes photographers completely lose the initiative to control aperture and door speed, and professional photographers rarely use program automatic exposure mode.

IV ..: Depth of field priority

Depth of field priority automatic exposure mode can accurately control the depth of field under the premise of ensuring correct exposure.

For example, for Canon EOS- 1 camera, when using the best automatic exposure of depth of field, first aim the autofocus area in the center of the viewfinder at the farthest object in the scene that needs to be clearly displayed, gently press the shutter button halfway, and then release the shutter button when the indicator light "DEP 1" appears in the viewfinder; Then, aim the autofocus area of the camera at the nearest object that needs to be clearly displayed in the scene, press the shutter button halfway, and release the shutter button when the "DEO2" indicator light appears in the scene frame. In-situ re-framing and composition shooting can ensure the correct exposure and depth of field range at the same time.