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I am watching a tutorial on Cam Tracking, but I already met an obstacle in the beginning. I shot a footage, which I want to use for cam tracking, with a Cubot S350, a cheap cell phone from mainland China.

After having distributed the markers on the footage and calculated their tracks, I have to input at least two information about the cam:

  • width of the CCD sensor
  • focal length

I have searched for a long time, but I found only the sensor width and a couple of other parameters but none of them the focal length. Even on the internet page of the manufacturer inside the specs, there is just a blank space next to focal length.

Is there a way to find it out, do cellphones have a few typical focal lengths I could try, can I calculate the focal length from other given features?

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