Review on 📷 K&F Concept 67mm ND 8 Filter and CPL Circular Polarizing Filter 2 in 1: Multi-Resistant Coating, Ultra Clear & Waterproof by Sean Maples

I ordered this filter because of the online reviews. I liked the concept of a combination of a fixed internal ND + a circular polarizing filter (external) for long exposure shots like waterfalls or seascapes. The price seems very reasonable. Unfortunately, the rotating CP filter is very rigid, which makes its use almost impossible, with some risk of the entire filter falling off the lens during activation (rotation) of the polarizing filter. Unfortunately I had to send the filter back without even trying the camera on to judge the optical quality etc.