A:Answer These should screw into your outer lens. They will NOT reduce/eliminate prop blur. You cannot adjust the exposure with just a filter. The CPL (circular polarized lens) will reduce glare and increase detail. The ND4 & ND8 filters (neutral density) will darken the image (the higher the number, the darker the filter). You'll need a camera with adjustable exposure settings to reduce/eliminate prop blur or a high speed video camera.
