Comment 1 for bug 786035

It detects focal length and crop factor with the same code as hugin. There was a little bug inside bringing these values to GUI. This is fixed in rev. 5cb5a33d8d5b
Concerning the values for image centre shift: I think the quality of these values depends on the image and the quality of the detected lines. So if the lines are bad or bad distributed it can result in "wrong" values. Check the corrected preview, if they are plausible.