I'm looking into alternatives for the Lee brand polarizer here, but what I can't figure out is, if it matters if I am getting a 7.5 or 4.5mm.
I had heard that the slimmer the polarizer, the less vignetting there will be at wider settings, but I can't seem to find any explanation or reasoning behind this. One place suggested that this was due to the filter being closer to the lens. Well, in that case, shouldn't this Lee system be terrible, since it places the polarizer all the way down at the end of the other filters? And surely in that case, a few mm either way won't matter. Secondly, Lee claims that this setup actually allows for a MUCH greater range of polarization without vignetting. Not sure I understand that. Also, I always thought the problem with polarizing wide angles was in uneven distribution of light/color, I don't see how it could help with that.
In any case, I just need to know if there's any reason to select the wider or thinner polarizer, thanks!
Thanks in advance for your determination in passing the verification steps just to answer my post, seriously!