Instantly convert shutter angle to shutter speed for any frame rate — 24fps, 60fps slow-mo, or 120fps high speed.
Exact Math: 1/48.0 seconds
The 180-degree shutter rule is the cinema standard for exposure timing. It dictates that your camera shutter speed should always be set to 1 ÷ (2 × Frame Rate). This reproduces the natural motion blur that human eyes perceive when objects move through space.
| Shooting Frame Rate | 180° Cinema Shutter Speed | Common Camera Dial Setting |
|---|---|---|
| 24 fps | 1/48 sec | 1/50 s |
| 25 fps | 1/50 sec | 1/50 s |
| 30 fps | 1/60 sec | 1/60 s |
| 60 fps | 1/120 sec | 1/125 s |
| 120 fps | 1/240 sec | 1/250 s |
Q: What happens if I shoot at 24fps with a 1/500s shutter speed?
Your video will lose natural motion blur. Moving subjects will look jittery, strobed, and robotic (often called the 'Saving Private Ryan' action look).
Q: Why do Cinema Cameras use Shutter Angle instead of Shutter Speed?
When you shoot with a Cinema Camera (like BMPCC 6K or RED) in Shutter Angle mode (180°), the camera automatically adjusts the shutter speed whenever you change frame rates from 24fps to 60fps, keeping motion blur perfectly proportional without manual recalculation.
