Question

If you were to shoot for slow motion, at what frame rate would you shoot?

• A. 8 frames per second
• B. 16 frames per second
• C. 24 frames per second
• D. 64 frames per second

Hint:

A simple mnemonic for frame rates is: "Shoot fast to play slow. Shoot slow to play fast."

Answer 1

The Correct Option is D

Step 1: Understanding the Concept:
The perception of motion speed in video depends on the relationship between the frame rate at which the video is captured (shot) and the frame rate at which it is played back.
Step 2: Key Formula or Approach:
- Normal Motion: Capture Rate = Playback Rate. - Slow Motion: Capture Rate>Playback Rate. - Fast Motion (Time-lapse): Capture Rate<Playback Rate. The standard frame rate for cinematic playback is typically 24 frames per second (fps).
Step 3: Detailed Explanation:
To achieve a slow-motion effect, we need to capture many more frames per second than will be played back. When these extra frames are spread out over time during playback at a standard speed (e.g., 24 fps), the action appears to slow down.
Let's evaluate the options:
- A (8 fps) and B (16 fps): These frame rates are lower than the standard 24 fps. Shooting at 8 or 16 fps and playing back at 24 fps would result in fast motion.
- C (24 fps): This is the standard rate for normal motion. If you shoot at 24 fps and play back at 24 fps, the speed will be normal.
- D (64 fps): This frame rate is significantly higher than 24 fps. If you shoot footage at 64 fps and play it back at 24 fps, the action will be slowed down to \(24/64 \approx 37.5%\) of its original speed, creating a clear slow-motion effect.
Step 4: Final Answer:
To shoot for slow motion, you must use a high frame rate. Among the given options, 64 frames per second is the correct choice.