Create dynamic images in creative ways. For example - In Manual mode the Variable ND filter allows the photographer to select a slower shutter speed and a specific aperture to achieve the desired Depth of Filed - for example 1/2 second and f/4.0 for motion blur and moderately shallow DOF. Once dialed in, simply turn the variable ND filter's ring until the camera's exposure meter zeros out. Use this technique to create images of sharply rendered subjects against motion-blurred backgrounds.