What do you mean, the picture is blurred?

When the camera is shooting, there is a focusing process. Under normal circumstances, the position of the focus and the image are clear. At the same time, before and after the focal length of the lens, there is a so-called depth of field, which is the range from focusing to blurring in popular parlance.

The larger the aperture of the lens, the smaller the depth of field. On the contrary, the bigger it is.

Take the following figure as an example. The emphasis is on flowers, so flowers are very clear. Because of the large aperture and small depth of field, the picture before and after the flower, that is, out of focus, is blurred. This ambiguity is intentional, which makes the audience focus on the flowers. This process is generally called fuzzification.

The most commonly used are portrait photography and close-up still life photography. Highlight the theme.

However, in landscape shooting, sometimes blur is avoided and more scenery is displayed.