I'm not suggesting Lensfun be expanded to take focus distance into account, my impression is that this aspect of EXIF data isn't very reliable (yet) anyway... I was only suggesting that this could explain why a "trustworthy" TCA dataset could still produce the (non)correction the original poster was complaining about. It's also the reason why I never submitted my TCA calibrations for the Olympus XZ-2 to Lensfun; They seem to be wrong almost as often as they're right, and I suspect that optically complex zoom lenses with internal focus (such as the Sony lens in question) may exhibit this more than other cases.
In any case, my solution is to use the manual TCA adjustment in the darktable lens correction module whenever it seems needed. In my case it's mostly with close focus images. On Wed, Jul 15, 2015, at 23:02, Torsten Bronger wrote: > Hallöchen! > > [email protected] writes: > > > [...] > > > > I don't have a good understanding of optics, but I've found the > > calibration data that I made myself for a zoom lens can give > > perfect results for some images and wrong for others. The most > > obvious cases are when focus distance is very small. I wonder if > > the complexity of the various elements in some lenses means that > > proper correction would have to take focus distance into account? > > Of course the focus distance is important: Lensfun's corrections > only work for focus at infinity, which is why I urge people to take > test pictures at a minimal distance. > > Theoretically, Lensfun coud be expanded to take focus distance into > account, but this makes calibration much more complex, and I > personally don't think that people will do that. But it could be > done, so if there is demand, just open a feature request. > > Regards, > Torsten. > > -- > Torsten Bronger Jabber ID: [email protected] ------------------------------------------------------------------------------ Don't Limit Your Business. Reach for the Cloud. GigeNET's Cloud Solutions provide you with the tools and support that you need to offload your IT needs and focus on growing your business. Configured For All Businesses. Start Your Cloud Today. https://www.gigenetcloud.com/ _______________________________________________ Lensfun-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/lensfun-users
