Helicopter Rotor Blades matched by Camera Shutter Speed + Frame Rate 🚁 How is this Chopper Moving?

Helicopter Rises Without Moving Rotor. The Optical Illusion is generated by the Video Camera Frame Rate that is Synchronized with the Turning Rotor Blades Frequency.
A video is a fast sequence of frames, so single photos. The synchronization between the video frame rate and the rotor blades angular speed means that every single frame is shoot when the rotor blades are in the same position 🚁

➡️ The video camera shoots a frame of the video, the rotor blades turn of a specific angle, the video camera shoots another new frame but at that point in time, the rotor blades will be at the same relative position as in the previous frame.

The video camera shutter speed is also important. The video camera shutter speed must be fast enough to "freeze" the action. A too-long video camera shutter speed will give to the rotor blades the time to do a relatively large angular movement that will be captured in each frame 📹

This will generate a sense of movement in the spectator that watches the video. Instead, a very fast video camera shutter speed will fix the rotor blades on the frames like they are stopped 📸

➡️ It is really complex to reach those video camera settings. You must have a video camera with a variable frame rate, you must have enough sunlight to let you use a fast video camera shutter speed and you have to find the correct parameters while following the helicopter in flight with a long focal length lens.
Helicopters Viral Video in 4K UltraHD 🚁

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Видео Helicopter Rotor Blades matched by Camera Shutter Speed + Frame Rate 🚁 How is this Chopper Moving? канала Flight Video & Photo