Traditional Culture Encyclopedia - Photography and portraiture - What methods can be taken in photography to reduce the depth of field before and after the subject?

What methods can be taken in photography to reduce the depth of field before and after the subject?

1 2

Four factors affecting depth of field

Aperture size Aperture size is inversely proportional to depth of field

The focal length is inversely proportional to the depth of field.

The shooting distance is proportional to the depth of field.

The diagonal length of the photosensitive element is proportional to the depth of field.

It is definitely right to use a large aperture to reduce the object distance, but I think it is too one-sided to speed up the shutter speed. If the camera uses program exposure or shutter priority, it is also equivalent to a large aperture, because the shutter speed is selected according to the result of camera photometry, and the aperture automatically adapts to the shutter speed, but the manual mode is used. In order to reduce the depth of field, we should first use a large aperture and match the shutter according to the result of photometry, so I think it is better to choose 1 and 2.