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POPSLong Exposure - (5 sec rule of thumb) "The scene: A place with a crowd of people, or a view with moving traffic, or a landscape with running or moving water. Dim lighting, or twilight/dusk, is best." "The equipment: A camera that allows you to manually set the exposure time, a tripod if appropriate for the location (otherwise, a way to hold the camera completely still), and a remote shutter release or timer (hands-off shutter firing)."