Hallöchen! Fabien Castan writes:
>> 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? Of course this doesn't work, too. :-) > When you are doing the calibration do you also compute the focal > value? Do you mean focal distance or focal length? > Or do you use directly the metadata information and only compute > the distortion? I use from the metadata the camera model (sensor size), lens model, and the focal length. For vignetting, I also use the aperture. The focal distance is set to infinity (unless the creator of the images tell differently). Tschö, Torsten. -- Torsten Bronger Jabber ID: torsten.bron...@jabber.rwth-aachen.de ------------------------------------------------------------------------------ _______________________________________________ Lensfun-users mailing list Lensfun-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/lensfun-users
