How to get the minimum depth of field and the maximum depth of field

Get the minimum depth of field: in a photo, the effect of small depth of field can blur the environment and make the subject clear, which is one of the effective ways to highlight the subject. The smaller the depth of field, the stronger the virtual paste of this environment and the more prominent the subject. The easiest way to get the minimum depth of field in shooting is to use the maximum aperture. If the light is too bright, using the maximum aperture to match the fastest exposure on the camera is still excessive. One of the solutions is to use a gray filter, and the other is to switch to a film with a lower film speed. In addition to using the maximum aperture, shortening the focal length and switching to a lens with a longer focal length can also reduce the depth of field. However, it should be noted that if the focal length is too close, the perspective of the foreground and background will be too strong, resulting in a sense of distortion. Under the premise of not affecting the composition effect, the minimum depth of field can be obtained by using the lens with maximum aperture+shortest distance as far as possible+long focal length. Get the maximum depth of field: In order to make all the subjects appear clearly on the screen, you need as large a depth of field as possible. The greater the depth of field, the higher the definition of the subject. The easiest way to get the maximum depth of field is to narrow the aperture and use the smallest aperture on the camera as much as possible. If the light is too dim, when the minimum aperture is used and the corresponding shutter speed is too slow to shoot with a hand-held camera, one of the solutions is to use a tripod or similar bracket, and the other is to switch to a film with higher film speed, which can also enhance the lighting for indoor shooting. Maximum depth of field can be obtained by using minimum aperture+shortest focal length lens+hyperfocal distance focusing.