Last Updated 3 hours ago
Filmmaking Dictionary: Number 2 / 24 fps
Definition
24 fps means 24 frames per second. At true 24.000 fps, a camera records or a system presents 24 successive images during each second. It is a familiar motion-picture rate, but the number alone does not guarantee a particular cinematic look.
True 24 fps is different from 23.976 fps. Some camera interfaces use rounded labels, so confirm the actual recording rate when timing and delivery requirements matter.
Frame Rate and Shutter Time
Frame rate determines how often images are recorded. Shutter time determines how long each frame gathers light. At 24 fps, a 180-degree shutter corresponds to 1/48 second. A shorter exposure reduces motion blur; a longer exposure increases it, within the camera’s operating limits.
Changing the shutter does not turn 24 frames into 48 frames. It changes the appearance of movement within the existing frames. These two controls should be discussed separately when the director asks for sharper movement or a different motion texture.
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Camera Movement Matters
Fast pans or objects moving quickly across the screen can show conspicuous judder at 24 fps, particularly with short shutter times or high-contrast detail. Lens choice, framing and the speed of the move affect the result. Test the actual move instead of assuming a familiar frame rate will make every pan look smooth.
Blocking and editing can also help. Following a moving subject keeps that subject more stable in the frame while the background moves. A static composition creates a different impression as the subject crosses it.
Normal Speed and Slow Motion
- 24 recorded and 24 played: The action runs at its recorded speed.
- 48 recorded and 24 played: Preserving every frame produces half-speed action.
- 120 recorded and 24 played: Preserving every frame produces five-times-longer playback.
- 23.976 material at true 24: A small speed change occurs if the footage is simply reinterpreted.
Production Checks
Choose the project rate with post-production before shooting. Match the intended timeline and timecode workflow, then identify any shots recorded off-speed. Keep shutter and flicker tests separate from the choice of project rate, especially around practical lights, LED walls and displays.
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Frequently Asked Questions
Does 24 fps always look more cinematic than other rates?
No. Composition, lighting, movement, performance and presentation all contribute to the result.
Is 1/48 second mandatory at 24 fps?
No. It is the exposure time associated with a 180-degree shutter, a common starting point rather than a requirement.
Related Terms
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