VND0.3-1.5FILTER, it is convenient to use multiple neutral density values, as a photographic filter for controlling depth and exposure. Provides 1 to 5 stops of light controlIts principle is the same as the polarization filter - through the rotary filter frame, allowing the Light intake to change. Note: Do not adjust to the most black, there will be a cross. Of course, there will be many photographers to use it, create unexpected photography effects. NO have X.