You need to provide more than just general information to get a intelligent answer.
What brand polarizer, sample photos, camera used, lens used, settings, etc. Don't forget that the best brands are also big targets for counterfeiters, and there are a ton of B+W counterfeits out there that often have issues. Its easy money for those who make them.
Gear I used is 5D mk III + 24-70 and 70-200 (in my signature
), both with BW kaesemann filter.
Both filters are genuine, I do not worry about this, both were bought from authorized dealer and also had hologram on case.
Basically is doesn't surprise me to see this effect when I'm using 24-70, it's quite wide on FF and I try to be carefull when using this lens with polarizer. More I was surprised to see this effect when I used my 70-200 with polarizer. Maybe relevant information is, it was in mountains when I noticed it(2000m+)What I would like to know is how to prevent this situation of uneven polarization with longer lens?
How to solve this issue? Sometimes the reflection has to be cut with polarizer or colors need a little boost, but sky is then uneven ... do you take more shots? Or do you take a shot with and without polarizer to solve it?
I'm sorry not to upload any photos, if it's necessary I'll add them later (I'm not on my main computer right now)