Product details:

With it's 2.7" colour touch screen and truly innovative and sophisticated features, the Sekonic Speed master L-858D leads the way to the next generation of light measurement control as the world's first multi-function light meter for photographers and filmmakers. When combined with the optional wireless connected dedicated modules for Elinchrom Skyport, Phottix, and Pocket Wizard products, the Sekonic Speed master L-858D also provides ultimate control to photographers seeking a faster and more streamlined workflow. Limitless creative possibilities are within reach through the meters ability to measure High Speed Sync (HSS) and calculate correct ambient-flash exposure for precision flash exposure control. With an increased light-sensitivity and extended ISO and Shutter Speed Ranges, the Sekonic Speed master L-858D enables all image-makers to obtain measurements in extremely low light and turn those readings into creative decisions. Finally, matching the high-ISO capabilities of todays cameras, by accurately metering in low-light, is finally possible. Understanding flash duration is the first step in freezing fast-moving subjects. Since all cameras are limited to relatively low sync speeds, stopping motion in a single image is often achieved by leveraging short flash durations with the cameras max sync speed. A long-held secret of some of the worlds most talented photographers, the key to freezing action consistently is found in being able to measure flash duration. Photographers are now able to do this easily for the first time, demystifying one of photographys most challenging techniques.1??Spot Metering with Viewfinder
Measuring Range: -5 to 22.9 EV (ISO 100)
Illuminance Range: 0.1 to 2,000,000 lux
Extensive Range of Cine & Video Settings
HSS Flash & Flash Duration Measurements
Flash Analyzing Function; Extended Range
2.7" Touchscreen LCD; All-Weather Design
Optional Radio Control Modules