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The 50mm focal length lens is also called a standard lens because its viewing angle of approximately 39 degrees on the full frame is equivalent to the field of view of the human eye. It is said that the lens is the third eye of the photographer. The world seen through a 50mm lens can most truly restore the atmosphere of the scene at that time; a wide-angle lens, in short, has a short focal length, a wide angle of view, and a deep depth of field. lens. The basic characteristics of a wide-angle lens are that the lens has a large angle of view and a wide field of view. The range of scenery observed from a certain viewpoint is much larger than what the human eye can see at the same viewpoint, and the depth of field is long; a telephoto lens can ignore redundant images and highlight the subject. . The telephoto lens has a relatively narrow angle of view and can focus on the subject or portrait, so it can avoid unnecessary factors and make the subject of the photo more focused.