How does a SLR capture the effect of rotating a blurred background?

The first method: Don't press the shutter button too fast. Generally, in the range of 1, 15s to 1 60s, aim the camera at the central focus, rotate the camera around it, press the shutter button during the rotation, and continue to rotate after pressing the shutter button, so that the effect of rotating blurred background can be taken with a SLR camera.

The second method: the effect of rotating blurred background shot by SLR camera belongs to the depth of field shooting method, so you can use the telephoto end, use the maximum aperture and shoot as close as possible to the object;

The third method: you can change a lens with a constant large aperture, bring people closer to the viewing position by focusing, and then quickly focus and press the shutter.