The Okko Pro Variable Neutral Density Filter - 67mm has been designed as a single ND filter that does the job of multiple ND filters. A Large Range Without Compromising Quality With the adjustable ring on the filter, you are able to quickly and easily adjust the strength of the light reduction between an ND2 and an ND400 That’s a range of 1-9 stops, for small to major changes to light levels. This adjustment in light is achieved without compromising the image quality or the colour of your image. You can reduce the amount of light quickly to get a slower shutter speed or more wide-open aperture. The high quality is achieved through the use of an anti-reflective multi nano-coating on the Japanese AGC optical glass. All of this is framed by an aluminium alloy ring which is waterproof and can be rotated a full 360°. Creative Options By reducing the amount of light that is coming through your lens you open up a whole range of dramatic and creative effects, in bright light, that would generally not be possible. This filter is well suited to all types of photography as controlling the amount of light is critical, but it is well suited to landscape photographers, videographers, filmmakers, event shooters, portrait, documentary work and much more. Creatives on the move can easily dial in the adjustments with the spinning ring on the variable ND as the light changes. Wedding videographers and photographers will find this especially useful when moving from indoors to outdoors and back again quickly.