The Phottix Variable ND Multi-coated Filter (VND-MC) can reduce light reaching your sensor by up to 8 stops. It’s very easy to use: When mounted on a lens, turn the filter to increase or decrease the density.
Unlike traditional ND filters, focusing is easy with the Phottix VND-MC. Pre-focus your scene and turn the filter to increase the density. The Phottix VND-MC Filter makes slower shutter speeds possible for special effects and video applications.