What is shutter angle and how does it influence motion blur in film?

What is shutter angle and how does it influence motion blur in film?

• A. The arc of the shutter; larger angles create more motion blur, smaller angles reduce it.
• B. The arc of the shutter; smaller angles create more motion blur, larger angles reduce it.
• C. The arc of the shutter; shutter angle has no effect on motion blur.
• D. The arc of the shutter; shutter angle only affects exposure, not blur.

Answer: (A)

Shutter angle is the arc of the shutter that is open during each frame, controlling how long the film is exposed. Motion blur comes from capturing moving subjects while the shutter is open; a larger shutter angle means a longer exposure for each frame, so more of the movement is recorded and the image becomes blurrier. A smaller angle shortens the exposure, reducing motion blur. That’s why the correct statement says the arc of the shutter; larger angles create more motion blur, smaller angles reduce it. Keep in mind that changing the angle also affects brightness—more exposure means more light reaching the film, so you may need to adjust lighting or film speed to maintain proper exposure.