The Sekonic Speedmaster L-858-D is the first lightmeter to not only read the light but also give you decent feedback on the flash duration. Retractable Lumisphere & 1° Spot The Sekonic L-858D-U has a retractable lumisphere that enables you to measure both flat and 3 dimensional objects. The 1° spot is perfect for landscape photographers and measuring the contrast of any scene. Measure Flash Duration The first fully functional exposure meter to measure flash duration. Now know if your flash will freeze your subject. Retractable Lumisphere & 1° Spot The Sekonic L-858D-U has a retractable lumisphere that enables you to measure both flat and 3 dimensional objects. The 1° spot is perfect for landscape photographers and measuring the contrast of any scene. Incident Metering for Ambient & Flash 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 For PocketWizard Elinchrom and Phottix