Hallöchen! Owen Mays writes:
> [...] > > I have a lens (Nikon AF-S DX 16-80 mm zoom) that is not supported > by lensfun, and I thought this is the perfect opportunity to give > back to the project by contributing calibration data! [...] We have distortion data for this lens for a couple of weeks now. Feedback of its quality is greatly appreciated. > [...] > > For Vignetting correction, I read Torsten's instructions here: > http://wilson.bronger.org/lens_calibration_tutorial/ > > How even does the even illumination need to be? If I have a > suitable diffuser, could I aim at the sky for the vignetting > images? Yes. > I am concerned that if I point a standard floor lamp at the > ceiling it will have a distinct circular illumination pattern. Nevertheless, this will work, too. > For TCA correction: I haven't found a good target for TCA. Does > this calibration need a regular geometry (like the buildings used > for distortion?) The geometry is unimportant. Sharp high-contrast edges with different distance from the image centre count. > Or are trees against an overcast sky ok? No, because this is often dominated by longitudinal CA and blown-out highlights. Tschö, Torsten. -- Torsten Bronger Jabber ID: [email protected] ------------------------------------------------------------------------------ What NetFlow Analyzer can do for you? Monitors network bandwidth and traffic patterns at an interface-level. Reveals which users, apps, and protocols are consuming the most bandwidth. Provides multi-vendor support for NetFlow, J-Flow, sFlow and other flows. Make informed decisions using capacity planning reports. http://pubads.g.doubleclick.net/gampad/clk?id=1444514421&iu=/41014381 _______________________________________________ Lensfun-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/lensfun-users
