At the heart of its usability is a 2.7″ color touchscreen LCD that provides quick access to functions and settings, all within an intuitive interface. A 270° rotating and collapsible lumisphere adapts to your light source and angle, while an integrated 1° spot viewfinder allows for pinpoint reflected readings—ideal for measuring specific areas of a scene. Additionally, the meter’s enhanced sensitivity allows it to record ultra-low-light levels, expanding its range for both ambient and flash measurements.

One of the L-858D-U’s standout features is its ability to measure flash duration within a wide range (1/40 to 1/55,500 sec), supporting t0.1 to t0.9 readings for analyzing flash performance. It’s also equipped to handle high-speed sync (HSS) measurements, making it one of the first meters to accurately measure HSS output. The Flash Analyzing Function enables users to balance ambient and flash exposure, displaying the percentage of flash in the final image and allowing for on-the-fly adjustments.

For advanced wireless workflows, optional radio modules add triggering support for PocketWizard and Elinchrom/Phottix systems. Expanded shutter speed support now includes ranges from 1/64,000 sec to 30 minutes for ambient light, and 1/16,000 sec to 30 minutes for flash. A comprehensive set of cinema and video modes includes shutter angles from 1° to 358°, frame rates from 1 to 1000 fps, and 20 user-defined custom settings for extreme precision.

Durability is also a focus—the L-858D-U features all-weather construction with dust and splash-proof protection (JIS Class 4). A micro-USB port allows for firmware updates and data transfer, and exposure profiling is supported via Sekonic’s Data Transfer Software. Whether working in still photography or cinematography, the Speedmaster L-858D-U is a feature-rich and future-proof meter that’s built to elevate your creative control on any set.