What does the zoom of mobile phone photos mean? What happened?

Zoom is another focus of the lens, focusing on zoom ability. The so-called zoom capability includes optical zoom, digital zoom and dual camera zoom.

Although both of them are helpful to enlarge distant objects in telephoto shooting, only optical zoom can support adding more pixels after the main body of the image is imaged, making the main body not only larger, but also relatively clearer. Usually, the larger the zoom factor, the more suitable for telephoto shooting.

Optical zoom, like traditional camera design, depends on the focal length of the lens, so the resolution and image quality will not change. Digital zoom can only reduce the size of the original image and make the image larger on the LCD screen, but it does not help to clarify the details.

Extended data:

Focus with a long focal length. When using zoom lens, the correct focusing method is to focus with a long focal length first, and then choose the appropriate focal length to shoot; Because under the long focal length, the image of the subject is the largest and the depth of field is the smallest, which is convenient for accurate focusing.

In the case of backlight or complex light, it is also helpful to choose appropriate partial metering, and it is not necessary to be close to the object for metering. Usually, when shooting, we often use a zoom lens with medium and long focal length as the main lens, focus on metering with the longest focal length, and then select the ideal focal length after locking the exposure, so that we don't have to move back and forth.

Although most photographers are extremely concerned about the zoom magnification of the zoom lens, they often use the long focal length at one end, and some even regard it as a fixed-focus telephoto lens. In fact, when you try to use other focal lengths to get completely different pictures, you will find that