Sekonic Speedmaster L-858D-U Light Meter (401-858)

Sekonic L-858D-U Speedmaster is a professional multi-function light meter engineered for photographers and cinematographers who require advanced flash and ambient measurement precision. Featuring both incident metering and a built-in 1∞ reflected spot viewfinder, it enables accurate evaluation of highlights, shadows, and overall exposure balance. The meter measures flash duration including brief HSS bursts, providing critical data for high-speed sync and action photography applications. With an extended measuring range of -5 to 22.9 EV at ISO 100, it delivers reliable performance across diverse lighting environments. Designed to support multi-brand radio triggering modules, the L-858D-U integrates wireless control compatibility with select Phottix, Elinchrom, PocketWizard, Godox, and broncolor systems through optional transmitter modules. The intuitive interface streamlines exposure adjustments while maintaining professional-level accuracy. Included accessories such as strap, soft case, and anti-glare film enhance durability and usability in studio or field conditions. Built for demanding production workflows, the Speedmaster L-858D-U combines advanced flash analysis, spot precision, and wireless flexibility to deliver consistent, repeatable exposure control for modern photography and motion production environments.

• Specifications: Incident ambient & flash metering, built-in 1∞ spot viewfinder, flash duration measurement including HSS, -5 to 22.9 EV range at ISO 100, optional radio triggering module compatibility, digital precision interface.
• Flash Duration Precision: Measures brief flash bursts and HSS output to evaluate t.1 and t.5 durations, enabling accurate control of motion freezing and high-speed synchronization.
• Integrated 1∞ Spot Metering: Built-in reflected spot viewfinder supports precise highlight and shadow analysis for advanced exposure balancing in complex lighting scenarios.
• Extended Measurement Range: Broad EV range ensures dependable ambient and flash readings in low-light and high-intensity lighting environments.
• Expandable Wireless Control: Compatible with optional radio modules supporting major lighting brands, enabling integrated flash triggering and remote power adjustment directly from the meter.