Hi Louis, Greetings from a fellow Pentaxian! :)
As discussed on http://www.pentaxforums.com/forums/10-pentax-slr-lens-discussion/304092-da-60-250-mod-ff-9.html the vignetting for this lens is caused by a mechanical baffle at the rear of the lens, and so the vignetting you're experiencing is likely not caused by sensor design. Several people have reported successfully removing or modifying the baffle, which fixes the vignetting with little to no reduced image quality. Samples here: https://www.flickr.com/photos/72309835@N02/sets/72157666809541434/with/26902896134/ -Karl On 12/04/2016 01:42 AM, Louis Granboulan wrote: > Dear all, > > I use a "smc Pentax-DA* 60-250mm f/4 ED IF SDM" on a "Pentax K-1". > This lens is not designed for full frame, but its only drawback is a strong > vignetting. > This vignetting does not show in the viewfinder, it only shows on the sensor, > which means it is "pixel vignetting". > Pablo d'Angelo's paper does not take into account pixel vignetting, and one > consequence is that lensfun cannot optimally correct this vignetting. I can > provide example pictures if you want to check this impossibility statement. > > I propose to work on adding to lensfun the possibility of using another > formula, with more parameters (higher degree polynomial). > If I do this addition, will it be integrated in the library, so I will not > need to maintain a homemade patch? > > Regards, > Louis > ------------------------------------------------------------------------------ > 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
