Hi Owen, there is already an entry for that lens in the current development version of the database where the distortion was measured for more focal lengths and seems to be a bit more detailed. Have you compared the distortion correction results with yours?
However, vignetting and TCA is still missing and I will add your values to the database. Sebastian On 20.04.2016 16:02, Owen Mays wrote: > Hi all, > > I have attached a calibration file for the Nikon 16-80 mm lens. I > followed Torsten's tutorial here: > http://wilson.bronger.org/lens_calibration_tutorial/. > > The one issue I see is with the vignetting correction, it seems to > over-correct a ring between the center and the corners. The amount of > overcorrection is small. I measured it by taking the image into my raw > editor (darktable), turning on lens correction, and boosting the > exposure until the clipping indicators appeared (in a ring around the > center). I then turned off correction (the clipping indicators went > away), and boosted the exposure until I saw clipping again (this time in > the center). > > The difference between these two exposures was at most 0.14 EV (at 16 > mm, where the strongest vignetting is). At longer focal lengths the > difference drops to 0.03-0.08. Probably not enough to worry about, and > certainly better than the 2+ stops of original vignetting. > > Let me know if there is anything else I should submit, or if there is > somewhere else I should upload the file for inclusion in the database. > > -Owen > > > ------------------------------------------------------------------------------ > Find and fix application performance issues faster with Applications Manager > Applications Manager provides deep performance insights into multiple tiers of > your business applications. It resolves application problems quickly and > reduces your MTTR. Get your free trial! > https://ad.doubleclick.net/ddm/clk/302982198;130105516;z > > > > _______________________________________________ > Lensfun-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/lensfun-users > ------------------------------------------------------------------------------ Mobile security can be enabling, not merely restricting. Employees who bring their own devices (BYOD) to work are irked by the imposition of MDM restrictions. Mobile Device Manager Plus allows you to control only the apps on BYO-devices by containerizing them, leaving personal data untouched! https://ad.doubleclick.net/ddm/clk/304595813;131938128;j _______________________________________________ Lensfun-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/lensfun-users
