The Arri Director's Viewfinder (PL Mount) is a compact handheld unit for viewing through the lens without the need for a camera. Ground Glasses are the standard ARRIFLEX 435 frame with hundreds of 35mm formats available. Ground Glass for RED shooters with both the 4K 16:9 and 2.1 active sensor area frame lines available. Custom formats using the ARRI Ground Glass On Demand Composer are also possible.