Xiao Ming took a photo of Xiaogang racing. After printing it out, he found that Xiaogang’s image was blurry but the scenery behind was very clear. Please tell me the reason.

This phenomenon occurs if the shutter speed is not high enough. Because the subject being photographed is in motion and the background is static. For stationary objects, no matter what the shutter speed is, as long as it is in focus, it will always be in focus, unless the shutter speed is so low that it becomes unstable when held in hand. When photographing moving objects, the shutter speed must be determined based on the subject's movement speed to freeze the moment of movement. The faster the object moves and the parallel displacement of the camera, the higher the shutter speed needs to be. In other words, in addition to the movement speed, the moving direction of the subject must also be considered.

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In general, a high-speed shutter is needed to freeze the moment of movement so that both the moving subject and the background are clear at the same time.

Of course, there is another shooting technique in sports themes, which is to deliberately use a slow shutter speed and the lens to follow the moving subject to complete the focusing and shooting, so that the moving subject is clear and the background is blurred, thereby reflecting a strong sense of movement. This technique It's called panning.