Here's how a light painting camera can render the space-time circle:
Prepare the light painting camera: Choose a camera that has a light painting mode or a long time** mode.
Determine the shooting environment: Choose a dark environment to better capture the light trail.
Set the camera parameters: Set the camera to manual mode and set the appropriate shutter speed (usually between a few seconds and tens of seconds). At the same time, set the ISO to a lower value to reduce noise.
Create a space-time circle: Use a flashlight or other light source to draw the space-time circle pattern you want in the air. Note that you need to be stable during the drawing process to get a clear image.
Shooting**: Press the shutter to shoot**.
Post-processing: Use image processing software to post-process, such as adjusting brightness and contrast, adding color, etc., to get a better visual effect.
It should be noted that when shooting light paintings**, it is necessary to maintain stability and avoid blurring the image caused by shaking. At the same time, you can also experiment with different light sources and colors to create a unique space-time circle effect. Also, adjust the camera's parameters, such as shutter speed and ISO, as needed to get the best light drawing effect.