What does shutter priority mean? Which is the priority, aperture or shutter?

Digital SLR cameras can choose a variety of automatic/manual exposure modes, including:

1. Shutter priority automatic exposure means that the shutter speed is set by itself, and the camera automatically adjusts the lens aperture value according to the photometric information to achieve correct exposure. This mode is suitable for shooting moving objects (sports photography, birds, etc.). ).

2. Aperture priority automatic exposure refers to setting the aperture value by yourself, and the camera automatically adjusts the shutter speed according to the photometric information to achieve correct exposure. This mode is suitable for controlling the depth of field. Often used in portrait photography, landscape photography and other occasions.

3. The program will be exposed automatically. This is a set of aperture-shutter combination parameters compiled in advance under different lighting conditions according to the photographer's experience. According to the photometric information, the camera gives priority to ensuring a certain shutter speed in low illumination to prevent the film from shaking by hand. When the lighting is ideal, determine the correct aperture-shutter combination to achieve the correct exposure.

4. AUTOmatic exposure (auto). That is to say, all the exposure parameters of the camera are determined by the camera, such as automatic ISO and automatic white balance. When the light is insufficient, the flash at the top of the camera will automatically pop up. This is an all-fool exposure mode, which can eliminate all human errors.

5. Manual exposure. That is, the shutter and aperture of the camera are manually controlled. This mode is often used in the case of strong light ratio, automatic exposure failure, long-time exposure at night shooting and so on.

The item 1-3 of exposure mode is generally called "creative exposure mode", which can achieve the expected effect of photographer's creation.