Sonic Speed master L-858D-U is the world's first multi-function, multi-brand wireless triggering light meter. It is the first of its kind capable of measuring flash duration and brief flash bursts like you find from HSS (High Speed Sync) for precision flash control.

Flash Analyzing Function - Measures ambient and flash simultaneously and automatically indicates the percentage of flash in the total exposure. HSS Flash Measurements - Finally, photographers now have an accurate way of measuring their lights when they want to overpower the sun or achieve a very shallow depth of field through using HSS. Increased Light Sensitivity - An additional 3-stops of light sensitivity for incident light, 2-stops, for reflected light (spot), and an ability to capture a reading down 0.1 lx of Illuminance. Radio Control Modules for Wireless Triggering - The L-858 Speedmaster Pro expands upon ground-breaking innovation by adding functionality for Elinchrom Skyport and Phottix Strato II/ Ares II users. Flash Duration Measurements - Understanding flash duration is the first step in freezing fast-moving subjects.

Manufacturer: MacGroup. Date First Available: March 2, 2017. Is Discontinued By Manufacturer: No. Best Sellers Rank: #65 in Photographic Light Meters. Customer Reviews: 4.7 out of 5 stars 156 ratings 4.7 out of 5 stars. Item model number: 401-858. : B06XD9K7PC. Item Weight: 8.8 ounces. Product Dimensions: 10.04 x 6.42 x 3.58 inches.