How to treat the basic knowledge of SLR-small aperture can take pictures with large depth of field?

In photography, in order to obtain more convenient operation, there are aperture priority exposure mode and shutter priority exposure mode.

1. Aperture priority mode

Aperture priority

Aperture priority means that the exposure value is calculated by the automatic metering system of the machine, and then the number of shutters is automatically determined according to the aperture size you choose. Manually set the aperture value, and automatically adjust the shutter speed according to the metering result. Generally used for shooting still life and controlling depth of field. The popular saying is to set the aperture value manually, and the camera directly gives the shutter value for matching.

Large aperture and small depth of field

The advantage of using aperture priority mode is that users can control the depth of field by themselves. In landscape photography, users need to set a smaller aperture when they want clear image quality near and far and shutter speed is not important. In figure photography, camera users prefer a larger aperture to make the background of the figure out of focus, so as to highlight the theme of the figure and dilute the background.

Shutter time is slow

Another advantage of using aperture priority is to let the camera choose the shutter speed to prevent inappropriate exposure time. In landscape photography, users will choose a larger aperture value when shooting waterfalls, that is, a smaller aperture combined with a longer shutter time will blur the waterfalls. But when shooting in dim light, the smaller aperture value, that is, the larger aperture, makes more light enter the lens.

2. Shutter priority mode

shutter priority

Shutter priority is to get the aperture value through camera metering when the shutter is defined manually.

Shutter time is very fast

Shutter priority is mostly used to shoot moving objects, such as sports, moving vehicles, waterfalls, flying objects, fireworks, water droplets and so on. Many people find the subject blurred when shooting moving objects, largely because the shutter speed is not fast enough. In this case, you can use the shutter priority mode, roughly determine a shutter value, and then shoot. And the motion of the object is generally regular, then the shutter value can also be roughly estimated. For example, the shutter speed for photographing pedestrians is only1125 seconds, while it takes11000 seconds for photographing falling water droplets.

3. Other modes

In addition to the above two exposure modes, there is also a program automatic mode (used in cameras? p？ Program automatic exposure is the product of the combination of electronic technology and artificial intelligence. When exposed in this way, the camera can not only calculate the appropriate exposure according to the light conditions, but also automatically select the appropriate exposure combination. In fact, many entry cameras have some fixed exposure modes, such as portrait mode, landscape mode and dynamic mode. The values of these modes are the default values of the system, which can't really meet the shooting environment at that time, so it is better to control the aperture or shutter yourself after some experience.