Example Concept: The 180-degree shutter rule is a fundamental cinematography principle that suggests setting the shutter angle to 180 degrees for smooth and natural motion blur. This means the shutter is open for half the duration of each frame, creating a balance between motion clarity and blur. For example, at 24 frames per second (fps), a 180-degree shutter angle results in a shutter speed of 1/48th of a second, which is ideal for most narrative film work.