Long exposure is required to get low-light photos. The less light that is available to reach the collection surface, the longer the shutter needs to remain open. The aperture setting also affects the amount of light available. For example; an f/11 requires half the time to collect the same amount of light as an f/22, but narrows your field of focus. Sometimes light moves during the exposure and you get a blur. This is an excellent way of telling if it is a long exposure, especially with moving water and other objects, but is not always present.
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