Sekonic L-858D-U (401-858) Meter plus RT-GX (401-628) Transmitter Module

The Sekonic L-858D-U Speedmaster Light Meter Kit pairs the flagship L-858D-U meter with the RT-GX Transmitter Module, adding wireless radio control via the Godox triggering protocol so you can trigger and adjust off-camera flashes right from the meter. The L-858D-U handles incident and reflected readings of both flash and ambient light across a wide -5 to 22.9 EV range (ISO 100), with a 2.7" color touchscreen and support for both photo and cine workflows.

• Dual Metering Design: a rotating, collapsible lumisphere for incident readings or an integrated 1-degree spot viewfinder for precise reflected readings.
• Flash Duration Measurement: measures flash duration from 1/40 to 1/55,500 second and supports high-speed sync flash metering.
• Wide Range: -5 to 22.9 EV incident, -1 to 22.4 EV reflected, ISO 3 to ISO 13,107,200, and illuminance readings down to 0.1 lux.
• Cine Metering Modes: 1-1000 fps and 1-358 degree shutter angle settings, with 20 user-defined presets down to 0.001 fps/degree precision.
• RT-GX Godox Transmitter Module: fits into the meter housing, adding 32-channel, 16-group 2.4GHz Godox-compatible radio triggering within a 98.4' range, plus remote modeling-light power adjustment.
• All-Weather Build: dust- and splash-proof to JIS Class 4, with a 2.7" color touchscreen LCD and Micro-USB for firmware updates and exposure profiling.