Photo filter CPL (Circular Polarizer filter) for cameras. In video are using cpl to reflections, blue sky, lights and lcd display. In video is tested filter Kenko PRO1-D CP-L(W) DMC LPF (Kenko Pro1 digital circular polarizer filter wideband, low profile frame, digital multi-coated). Kenko and Hoya, they are same. They are manufactured in same factory. You can with this filter create excellent photography :)
A short review of the Hoya Circular Polarizing filter (67mm) and example of how it reduces reflection and improves colour and contrast.