K&F Concept 82mm CPL Lens Filter with Copper Frame Circular Polarizing Filters 36-Layer Coating Optical Glass Polarizer for Camera Lens (Nano-X PRO Series)

Picture quality remains unchanged. Be careful on fitting this to your lens - slight finger tightness / torque only or there is difficulty in unscrewing - and keep undoing and 're tightening' to avoid stiction.On my next fitment, I may try a minute drop of vaseline applied with a cocktail stick to the filter thread to gauge any improvement.Recommended, but be aware.Thank you.

The actual polariser itself is good and works great, but I’ve never known a screw-in CPL weld itself to a lens like these do. They’re impossible to get off without completely ripping the CPL to pieces. Serious design flaw - I can’t even remove it for a refund at this point.