Dash Cam CPL Filter Explained: When It Helps (and When It Makes Footage Worse)
A CPL (circular polarizing) filter is a rotating lens filter that can cut certain types of reflections—mainly the shiny glare you get from dashboards and windshields in bright light. Here’s the part most accessory pages skip: a CPL is not a free upgrade. It trades light for reflection control. That trade can be worth it