Actually I have a similar experience.
When I use a curved ghostless filter with the glass flipped (so it is conacave) on my Pentax-M 20mm f4 it significantly improves the borders on my unmodified A7.
Oct 03, 2016 at 06:33 AM
Previous versions of Olaf G's message #13750406 « Kolari Mod's Improvements: A Summary of Tests »
