How does a SLR make such a photo into a circle?

The characteristic of follow-up photography is that the photographer rotates the camera with the moving direction of the moving object and presses the shutter while moving. In this way, the moving body is clear and the background is blurred, giving people a feeling of rapid movement.

When using the follow-up method, please note the following points:

1. In order to make the camera close to the face, the camera and the head rotate as a whole. You can also use a tripod if conditions permit. When shooting, first look at the position of the subject from the view frame, then press the direction of the object, rotate the camera accordingly, and press the shutter in time when the time is right.

When the shutter is pressed, the camera can't stop. You must press the shutter while rotating.

3. Don't use too high shutter speed, generally use1/60s, sometimes use1125s or1/30s. The shutter speed is too high, the action is not strong, and the following effect is not obvious; If the shutter speed is too slow, it is not easy to master technically, and the subject is easy to blur.

4. When shooting with the follow-up method, it is generally better to choose metering or backlight. You should choose a dark background, preferably with trees, mountains, houses or people. In this way, when the camera rotates, fuzzy lines will appear in the background. If the background is no scenery or dark, even if the camera is rotated, there will be no blurring effect.

The above is a copy for reference only.

According to personal time, the biggest problem is that the camera and the subject are not synchronized. It is appropriate to use shutter speed first (TV or S-file) 1/30 seconds or 1/60 seconds, so that the subject will not become blurred during the movement (people's expression will change). If you want to shoot something, you can shoot it on the turntable, and the shutter speed can be chosen at will.