On Wed, Jun 21, 2017 at 12:29 PM, Jan <[email protected]> wrote: > Hello list, > > I have a Sigma 17-70mm f/2.8-4.5 DC Macro for my Sony Alpha camera. It has > correction data in the lensfun database. However, it is not available for > correction data in e.g. Darktable. If I understand correctly this is because > lensfun does not return the lens because the cropfactor of the lens in the > database (1.611, Canon?) is larger than the cropfactor of my Sony (1.53). > Obviously I can make the effort to create calibration data with my own > camera, but I was wondering if there is a shortcut, e.g. changing the crop > factor of the existing calibration data. Yes, i'm pretty sure re-profiling is needed in such cases.
As you can read elsewhere, e.g. vignetting is more noticeable on FF compared to crop, thus, the vignetting profile computed for FF *could* be used for crop, but not the other way around. > kind regards > Jan Roman. > ------------------------------------------------------------------------------ > Check out the vibrant tech community on one of the world's most > engaging tech sites, Slashdot.org! http://sdm.link/slashdot > _______________________________________________ > Lensfun-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/lensfun-users > ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Lensfun-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/lensfun-users
