Shutter Angle Calculator — Cinematic Shutter Speed

The 180-degree rule sets the shutter speed to 1/(2 x fps). At 24fps, that is 1/48s. At 30fps, 1/60s. This produces the amount of motion blur that audiences perceive as natural and cinematic. It comes from film cameras where a 180° rotating shutter exposes each frame for half the frame period.

90° (1/96s at 24fps) reduces motion blur for a sharp, intense look — used in action sequences like Saving Private Ryan. 270° (1/32s at 24fps) increases blur for a dreamy effect. Higher angles let in more light, useful in dark environments.

Yes. Wider shutter angle = longer shutter speed = more light. Going from 180° to 90° halves the light (1 stop). Going from 180° to 360° doubles it (1 stop). This makes shutter angle a creative and exposure tool simultaneously.

To maintain 180° shutter angle in bright conditions, you need ND filters to reduce light. Without ND, you might need 45° (1/192s at 24fps) to avoid overexposure — resulting in unnaturally sharp, stroboscopic motion. ND filters are essential for cinema-quality outdoor video.