>>4478759
>>4478760
Shit quality CPLs WILL fuck your IQ. It will look like you're missing focus but you aren't. Just avoid the bottom of the barrel CPLs like amazon $10 one or the KF Concept K series.
I find aluminium rings to be a pain in the ass to remove and are too simple to overtighten. I buy URTH filters (formerly GOBE) and they fit smoothly and it's almost impossible to overtighten them.
I would pick one or two sizes and step-up ring the rest. I picked 67mm and 77mm. If I ever buy a lens that takes 82mm or up I'm just fucked, but that's typically only for f/2.8 zooms or f/1.4 primes.