The HD Mk II IRND64 is perfect for performing motion control or blurring objects and is therefore used to render movement of moving objects such as water flow, wave motion or moving people. Without an ND filter and with standard camera settings the movement would appear "still" on the final image. A flowing effect can be achieved through reducing the aperture to f/16 or f/22, but this may cause diffraction that makes the resolution and overall depiction poor. Also, when shooting with fast prime lenses and cameras that have ISO200 as their lowest sensitivity, it might not be possible to reduce the exposure enough to achieve a shutter speed that causes the "water flowing" effect. However, by using the HD Mk II IRND64 filter, it is possible to shoot at a proper f/ value to avoid "diffraction", and it is possible to lower the exposure to a necessary shutter speed value that can express the movement as "flowing".