This is a Brand new Tiffen Series 9 ND 0.2 Neutral Density Filter (2/3 stop), the box might be a little shop worn but the filter is brand new with full manufacture's warranty.In conditions of extreme light intensity, such as sunshine on snowy mountains or on the beach ND (Neutral Density) filters are recommended as essential. Neutral Density filters are often ignored by photographers, but they have several uses and offer the possibility to achieve otherwise unachievable results. ND filters appear grey and reduce the amount of light reaching the film, they have no affect on color balance. They have four main uses: 1.Enable slow shutter speeds to be used, especially with fast films, to record movement in subjects such as waterfalls, clouds, cars, seas etc. 2.To decrease depth of field by allowing wider apertures to be used, which helps separate subjects from their background. 3.To decrease the effective ISO of high speed film (ie: above ISO400) and allow it to be used outdoors in blight situations. 4.To allow cameras to record subjects such as snow, sand or other bright scenes which would normally cause over-exposure. ND 0.1 = Shutter Speed/ Aperture Decrease 2/3 Stop Increases exposure times without affecting image color or contrast.Ideal for snow or sand scenes, or infrared digital.photography when combined with an infrared filter. All warranty is done through the manufacture.