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Motion photography can be two different things. One where you stop motion with no motion blur in the background, or two, you have a motion blur in the background from where you followed a moving object. Nascar is a good representation of that because they are always moving. You can follow the moving object at a constant speed and get the motion blur in the background like the first one, with a slow shutter speed. Two, you can set a fast shutter speed and get completely stop motion like the second one.