Hello, I am a beginner, and I love photography. Excuse me, how is the ambiguity of background and prospect transformed?

1 Lou has already said it. Let me add something. The so-called background blur is actually called depth of field. The depth of field refers to the distance range that an object measured along the axis of the imaging depth of field machine can obtain a clear image in front of the camera lens or other imagers.

For example, if you photograph a person, the focus is on the person's eyes. Generally speaking, the background behind the person begins to blur. But the principle is not like this. It depends on the aperture size used at that time. If F 16 aperture is used (it belongs to the aperture with large depth of field, which means that the clear place around the focus is large), people and background will be clearer, which is common in the shooting effect of general card machine, because the aperture of general card machine is taught very carefully. If a large aperture such as F 1.2 is used, the human body will be relatively blurred from the eyes, which is called blurring. Similarly, taking a person as an example, suppose there are three points A, B and C, where A is a tree, B is a person and C is a lake. Sort by A, B and C, and then focus on human eyes. You find that A is blurred and C will be blurred. If you focus on a, the characters and c will be blurred. Focusing on C, A and B will be blurred.