Astronomik UHC just arrived. Tested it by covering the lens front with a white screen. I know I should expect some color casting, but I found that it appears like vignetting, and it does not go away with small aperture or long focal lengths. Is this normal? How should I remove this in post-processing? Thanks in advance.
Edited by YKQian, 14 August 2020 - 04:31 AM.