This 52mm (Arri Standard) Precision Diascope enables verification of proper back focus (focal flange distance) by rotating the gear to match the two given lines to zero. If at this point the given reticule (Siemens Star shown on the viewfinder) is in focus, your camera is set to a proper back focus. If this point is not clear, the +/- will determine which direction your camera needs to be adjusted. The focus gear allows for more certain verification, a critical need following the tightening of the back focus screws or shimming. For use on all Red and Arri Standard digital cameras. This is an active product and currently for sale. Now taking orders by email at support@uniqoptics.netFull Diascope Kit with Case
