I beg the photographer to explain how the stars in this picture are shot and how the effect is circled.

1. Install the camera on a tripod, which should be firm and convenient for long exposure.

2. Point the camera at Polaris, the star in the center of rotation in the picture, because other stars will revolve around Polaris.

3. Look at the brightness of the surrounding environment at that time. If it is brighter, reduce the aperture; If it is dark, you can use an aperture of about 8.

4. Expose for a long time with the B-door, at least for more than half an hour, so that the stars in the sky will shift and leave circles of light on the picture. The longer the exposure time, the longer the imprint.

Of course, you can use PS if you want to save trouble. But sorry, I can't. I heard it from someone else.