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What does slow door mean?

Refers to the long exposure technology in photography. Slow door photography is a photographic term. In slow-door photography, the shutter speed of the camera will be much slower than normal photography, which will blur the moving objects and make the static objects clearer.

Common slow door photography includes: night shooting, running water shooting, light track shooting, starry sky shooting and so on. In this kind of shooting, the shutter speed of the camera is between a few seconds and tens of seconds, so as to capture enough light and form a unique shooting effect.