Most of what I do in Blender is camera tracking. But there’s an issue I am still confused about, and I’d like to know which is the right way.
I film using my Samsung Galaxy S3, which has a focal length of 37mm. Therefore that is the focal length I should use for solving the camera motion. However, using 32mm gives a smaller track error, and also feels a bit better to me.
Is it a strict rule that the focal length of the device the video was taken with must be used for the camera in the Blender scene? Or should I go with the focal length that yields the smallest track error?