Spinning Image Perception

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    • #49387

      I have been having an ongoing argument with a filming colleague about the background image in the following situation. We would like to film a scene of someone spinning in circles and holding the camera on themself — but primarily on their upper torso at the end of a long rope spinning from a central pivot. Essentially this means having the person appear to be flying in circles at the end of the rope.

      My colleague says we can save time by just having the person hold the camera in front of their face and turning in circles (on a dime, as the saying goes) while holding the video camera on themself. I disagree with this perspective because of the background’s relative speed and arching as the background images pass from one side of the screen to the other.

      If your are at the end of a rope pointing the lens outward, the passing images will be faster and arch less than when the camera is positioned closer to the rotational center. As such, if you can visualize it, I argue that the effect of rotation (and even centrifugal force) is more noticeable, and hence, more accurate, when the camera is positioned more outward, towards the periphery.

      Any comments? (Why doesn’t my .jpg situational diagram upload?)

      Spinning Image Perception

    • #202255
      AvatarJackson Wong

      As a matter of fact, my colleague and I were talking about this physics phenomenon yesterday. My understanding of what you are trying to accomplish is getting a blurred background with the subject looking at the camera. I’m asking about the .jpg issue today) my quick tests of the two situations 1) Subject holding camera close and pivoting on his or herself. 2) Subject further from camera, both pivoting at the camera point.

      In situation 1) the background moves less quickly and felt more jerky. In situation 2) the background moves faster and up/down shifts were less apparent. So in short, I believe you are right, using the rope to increase the distance between the camera and the background is ultimately going to give you a faster spinning background.

      Hopefully you’ve got your question answered, please post your findings if you find out more.

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