SIRUI Square ND Filters Long exposure tool with exceptional polarized color. Model: SIRUI Square ND16 (1.2) 4 Stop Neutral Density Filter Function: Reduce the light entering the camera to increase exposure time. Material: Top quality Schott Optical Glass B270 Size: 100mm x 100mm SIRUI's Square ND Filters are perfect for shooting very bright landscapes The Square ND filter can be used for any scene to enhance the colour and overall balance of the image. In situations where there is too much light, the ND filter will help cut down on the light reaching the sensor, allowing the user to open up their aperture to achieve a more desireable depth of field. When increasing exposure time is the aim, these filters help you to slow down the shutterspeeds enough to help create the "milky water" effect in situation where it would be impossible to do without a ND filter What's in the box 1x Square Filter 1x Portable Padded Bag