> > I cannot explain the physics in detail, but it is so. Focus changes > distortion. Been there, done that: A couple of weeks ago I had to > remove a database entry because it had been taken at close focus, > and did not work *at* *all* for images taken at a large distance. >
But in that case, it is the same in the other direction, no? If you calibrate using a large distance, it doesn't work for close range pictures? When you are doing the calibration do you also compute the focal value? Or do you use directly the metadata information and only compute the distortion?
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