There is no photography without depth of field. Several effective methods to control depth of field.

3. Using the distance between the subject and the background to control the distance between the subject and the background is close, and the effect of shallow depth of field is difficult to show: when the subject and the background are at infinity, even a telephoto lens with a large aperture can not effectively blur the background. If possible, the camera should be as close to the subject as possible and the subject should be as far away from the background as possible, so that the effect of blurring the background is more obvious. Sometimes the subject is near and the background is infinitely far away, even if a wide-angle lens with a large aperture is used, the background can be effectively blurred. 4. Using the principle that the back depth of field is longer than the foreground depth of field, in photography practice, photographers should make full use of the front and back depth of field according to the formation characteristics of the depth of field, and generally can make full use of the depth of field by focusing. For example, if you take a close-up of a person on one side, you should focus on the eyes close to the camera. According to the principle that the depth of field in the back is longer than the depth of field in the foreground, one eye will be clearer and the other eye will be clearer: if the focus is set on the eye far away from the lens, the eye close to the lens is likely to be out of the depth of field, which looks soft and wastes the depth of field in the back. In the same way, for example, before and after shooting, the focus is selected in the second row, and the first, third and fourth rows are also relatively clear, that is to say, Quan Jingshen is used. 5. "Aperture Priority" and "Step Exposure of Depth of Field" are the most commonly used. Whether it is a SLR or a notebook computer, you can choose the aperture by manually shifting "M" and aperture priority mode "A" to maximize the role of aperture in controlling the depth of field. It should be pointed out that "large aperture" is not the aperture like F5.6 and F4 in the general sense, and the absolute aperture including F2.8 should also be selected. In fact, the difference of depth of field when choosing a mid-range aperture is relatively small at a general distance, and it is difficult to obtain an obvious short depth of field with an unreal large aperture in many cases. As far as the subject reflects the theme, the depth of field is not as short as possible, nor is it as long as possible. Sometimes it is necessary to blur the background properly, that is, the background can neither be so vague that people can't understand its specific connotation, nor so clear as to cause visual interference to the subject. Since SLR cameras take pictures with the maximum aperture, there will be some differences as long as they are not the same aperture value. When using traditional cameras, the depth of field prediction button on the fuselage is often used to check the depth of field effect. Digital SLR cameras also have the depth of field prediction button, which can check the actual shooting effect at any time. If necessary, you can use aperture priority mode to take several photos with different apertures on the premise of the same composition and shooting distance for later selection.