What factors affect the scenery?

The factors that affect the depth of field are: lens aperture, lens focal length, shooting distance

1. Lens aperture:

The larger the aperture, the smaller the depth of field; the smaller the aperture , the greater the depth of field.

2. Lens focal length

The longer the focal length of the lens, the smaller the depth of field; the shorter the focal length, the greater the depth of field.

3. Shooting distance

The farther the distance, the greater the depth of field; the closer the distance, the smaller the depth of field.

There is an allowable circle of confusion before and after the focus. The distance between these two circles of confusion is called the depth of field, that is: before and after the subject (focus point), the image still has a clear range. , which is the depth of field. In other words, the front and rear depth of the subject and the blur of the image displayed on the film surface are all within the limits of the allowable circle of confusion.

Based on the person holding the camera, the distance from the focus to the allowed circle of confusion at near distance is called foreground depth, and the distance from focus to the allowed circle of confusion at far distance is called back depth of field.

Depth of field can be large or small. Small depth of field can highlight the subject and is suitable for portraits. Large depth of field is suitable for landscapes. Correct understanding and application of depth of field will help you take satisfying pictures. There are three main factors that determine the depth of field:

1. Aperture When the focal length of the lens is the same and the shooting distance is the same, the smaller the aperture, the larger the range of depth of field; the larger the aperture, the smaller the range of depth of field. This is because the smaller the aperture, the thinner the light beam entering the lens, the more obvious the paraxial effect, and the smaller the angle at which the light converges. In this way, the light that converges behind and behind the imaging surface will leave a smaller spot on the imaging surface, making the originally unclear scenes near and far from the lens have acceptable clarity.

2. Focal length When the aperture value and shooting distance are the same, the shorter the focal length of the lens, the greater the depth of field range; the longer the focal length of the lens, the smaller the depth of field range. This is because a lens with a short focal length has a much narrower focus band for light coming from objects at different distances in front and back than a lens with a long focal length, so more light spots will enter the acceptable sharpness area.

3. Object distance When the focal length and aperture value of the lens are equal, the farther the object distance is, the greater the depth of field range; the closer the object distance is, the smaller the depth of field range is.