1. Gaffer Glass
By turning the rotatable front ring, cinematographer or gaffer can change the ND from 0.3 to 2.7 total of 9 stops. This will be able to provide very handy viewing tool for lighting effects on sets.
With its 49mm threaded front ring, users can add on seperate effect filters to achieve the final look that will be seen on camera and provide a preview of the look.