Photography white asks a few questions. About turning in the camera. Sunshine 16 law says: focus should be in the first third of the whole depth of field.

There are three factors that affect the depth of field, 1. Aperture. The larger the aperture value, the smaller the aperture, the greater the depth of field, and the greater the clear distance before and after. 2. Focal length, the shorter the focal length, the greater the depth of field; 3. Distance, the farther the camera is from the subject, the greater the depth of field.

This rule is universal for digital cameras and film cameras;

Rule of one-third: For example, if you shoot a row of oranges on the table, the first one is closest to you, the tenth one is farthest from you, and then you focus on the fourth orange, then the ratio before and after the depth of field is as follows: the distance from the fourth orange to the farthest orange is twice that from the fourth orange to the nearest orange, that is, 2: 1.

Finally, the setting of aperture and speed is determined according to the shooting intention, not according to the morning and evening of the day, which requires a lot of depth of field. Please refer to the first three factors I mentioned.