I recently purchased the Nisi V6 filter holder system with Landscape CPL (Circular Polarizer) filter. I’ve included the following image comparison using shots taken through the glass side panel of my current PC build. The image comparison is a shot taken without the CPL filter versus one with the CPL filter. The filter does an extaordinary job at removing the window reflections, while increasing contrast within the image. I found no image degredation while testing the filter at 1:1. The image used in this comparison is straight out of camera.