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Small rectangular transmitter module with matte black finish and Sekonic branding

Sekonic

Sekonic RT-GX Transmitter Module for L-858D-U #401-628

SKU CH-EXAJ-JFKK4

Transmitter module adds Godox radio control and HSS flash metering to the L-858D-U light meter, with 32 channels, 16 groups and 100 ft range

  • Full radio compatibility across 32 channels and 16 groups
  • HSS flash metering for accurate exposure at high shutter speeds
  • Remote triggering and power control up to 100 ft away
  • Next-level flash analysis simplifies lighting setup
  • Designed for L-858D-U light meters for integrated workflow

Sekonic RT-GX module for L-858D-U

The Sekonic RT-GX transmitter module adds Godox radio control to the L-858D-U light meter. It enables photographers to trigger and adjust compatible flash units directly from the meter. The module supports full integration with the Godox wireless system.

For Godox flash users needing meter control

Photographers who rely on Godox lighting and want to measure, trigger and adjust power from a single device will benefit. Users of other radio systems or those without an L-858D-U meter cannot use this module.

32 channels and 16 groups for Godox radio

The module provides access to 32 channels and 16 groups with wireless IDs for remote triggering up to 100ft away. It also supports high-speed sync flash metering and wireless modeling light control.

How it compares

Measured against everything we stock in Hot-Shoe Flash Units, at today’s prices. Recalculated every night.

Price $131.99
Typical for this category: the median of 163 items is $118.99.

Specifications

No published specifications for this item yet.

Questions about this item

Which Sekonic meter works with this RT-GX module?

The RT-GX transmitter module is designed for the L-858D-U (USA) light meter, adding Godox and Flashpoint radio control directly to that meter.

What does the 100-foot range mean when I am on set?

You can trigger and adjust Godox-compatible lights up to 100 feet (30 meters) away, including wireless modelling-lamp power control.

How many Godox channels and groups does the module support?

It provides full access to all 32 channels (1–32) and 16 groups (A–F, 0–9) plus Wireless IDs for multi-light setups.

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