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Long Exposure
A long exposure is an image that has been exposed for a long time or uses a long shutter speed. This technique is useful for shooting still objects in low light (used often by landscape photographers), or rendering moving objects into an artistic blur.

Manual
Manual mode allows the photographer to set the exposure instead of having the camera do it automatically. In manual, you choose the aperture, shutter speed and ISO, and those choices affect how light or dark the image is. Semi-manual modes include aperture priority (where you only choose the aperture), shutter priority (where you only choose the shutter speed) and programed auto (where you choose a combination of aperture and shutter speed together instead of setting them individually). Manual can also refer to manual focus, or focusing yourself instead of using the autofocus.