Re: [Lensfun-users] Creating a more flexible formula for vignetting correction?

2016-12-11 Thread Louis Granboulan
Torsten Bronger wrote: > Have you tested which degree you need? No. I have been trying to see what is needed without experimenting by modifying lensfun code, but I failed. My idea was to use the Fx special effects of ImageMagick to experiment with various correction formulas. But I have not

[Lensfun-users] Creating a more flexible formula for vignetting correction?

2016-12-04 Thread Louis Granboulan
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