Built-In Wireless Radio Triggering Incident Metering for Ambient & Flash 1° Spot Metering with Viewfinder Measuring Range: -2 to 22.9 EV (ISO 100) Flash Measuring Range: f/0.5 to f/161.2 Rotating & Retractable Dome Head Program with Custom Camera Profiles Latitude Display; Contrast Function Memory Mode; Flash Analyzing Function Backlit LCD; All-Weather Construction

The Blue Ring Gaffer’s Glass™ is an essential “Tool of the Trade” for professional set lighting. It is designed to allow you to locate the center of your key light or “hot spot” to accurately determine where to position lighting to achieve optimum coverage.