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Sekonic RT-GX Godox Transmitter Module

BH #SERTGX • MFR #401-628
13 reviews
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Sekonic RT-GX Godox Transmitter Module
Key Features
  • For Speedmaster L-858D-U Light Meter
  • Adds Godox Radio Triggering
  • Frequency: 2.4 GHz
  • Access to 32 Channels and 16 Groups
Add a 2.4 GHz Godox-compatible radio triggering protocol to your Speedmaster L-858D-U light meter with this RT-GX Godox Transmitter Module from Sekonic. Able to be fitted into meter's housing, this module provides multiple functions beyond triggering, including access to 32 channels and up to 16 groups and Wireless IDs for remote triggering within a 98.4' range. This radio control also permits adjusting the modeling light power, supports high-speed sync (HSS) flash metering, and enables Godox users to more easily measure the ambient-to-flash light ratio and flash duration.
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Sekonic RT-GX Overview

Add a 2.4 GHz Godox-compatible radio triggering protocol to your Speedmaster L-858D-U light meter with this RT-GX Godox Transmitter Module from Sekonic. Able to be fitted into meter's housing, this module provides multiple functions beyond triggering, including access to 32 channels and up to 16 groups and Wireless IDs for remote triggering within a 98.4' range. This radio control also permits adjusting the modeling light power, supports high-speed sync (HSS) flash metering, and enables Godox users to more easily measure the ambient-to-flash light ratio and flash duration.

EAN: 4962294012069

Sekonic RT-GX Reviews

No regrets at all

By Nickson
Rated 5 out of 5
Date: 2026-05-13

As someone who is a perfectionist and having slight OCD lighting used to stress me all the way out. I strongly dis light flat boring lighting. This device not only allows for me to get the perfect exposure before I call my model over to take the first shot, but now I can control my light straight from my light meter. I can literally work on one light at a time or have them all go off from my light meter. I feel like the photography Gods have spoon fed me and nothing will ever be the same for me again. This is going to invoke so much confidence into my clients for booking me. Some clients don’t have time for you to guess and take a hundred test shots. Some clients are so late that you don’t have time to figure it out. Some clients aren’t patient enough to sit there while you figure it out. I’m surprised that it took me this long to invest in my sanity.

Works good. Missing documentation

By Carlos
Rated 4 out of 5
Date: 2023-02-14

All great. The only feature that is not working correctly is the constant light on and off on a Godox 200p. When controling single lamps it would turn it on, but only turn it off if all of them are selected.

See any errors on this page?

Will this trigger a Canon ST-E3-RT?

Will this trigger a Canon ST-E3-RT?
Asked by: Robert
Unfortunately, it will not. This is for the Godox X wireless radio system.
Answered by: Jeremy
Date published: 2021-07-25

Will this work on a Godox V860iii speedlite?

Will this work on a Godox V860iii speedlite?
Asked by: Robert
As of the time of this writing (November 2023), the Sekonic RT-GX Godox Transmitter Module (B&H# SERTGX) is only designed to work in the Sekonic Speedmaster L-858D-U Light Meter (B&H# SEL858DU). The module serves as an interface between the aforementioned light meter and Godox flashes and strobes using the Godox X radio system such as the Godox Ving V860III TTL Li-Ion Flash Kit for Sony Cameras (B&H# GOV860IIIS).
Answered by: Yoni S
Date published: 2023-11-27

will this work on the L-358 Meter?

will this work on the L-358 Meter?
Asked by: Anthony
I do not have that model light meter so I fon't know. It works flawlessly wuth the 858 meter.
Answered by: Thomas
Date published: 2022-01-03

Before I buy this, I need to know if this will ...

Before I buy this, I need to know if this will work with the Sekonic L-358? I see someone said yes, but when I did a search online everything I'm seeing it only works with the L858D-U.
Asked by: Laurie
No, The following unit is designed and made for the speedmaster L-858D-U Light Meter. Not the L-358.
Answered by: hectorm
Date published: 2022-03-18

Are Sekonic L-858D and RT-GX compatible with ...

Are Sekonic L-858D and RT-GX compatible with Godox AD100Pro?
Asked by: seunghee
The Sekonic RT-GX Godox Transmitter Module in the Sekonic L-858D Speedmaster Light Meter is compatible with the Godox AD100pro Pocket Flash.
Answered by: Lawrence C
Date published: 2023-03-15

Will this work on the L-558 meter?

Will this work on the L-558 meter?
Asked by: Andres
No, the Sekonic RT-GX Godox Transmitter Module will only work with the following models. Lowepro DP Kit Sekonic Speedmaster L-858D-U
Answered by: hectorm
Date published: 2023-08-14

Will this work on the Sekonic L-758DR?

Will this work on the Sekonic L-758DR?
Asked by: Kinsley
Can confirm it does not work with the L-758DR
Answered by: Jason
Date published: 2023-06-09
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