---
product_id: 411712052
title: "Secondic Exposure Meter Speedmaster L-858D Dedicated Transmitter RT-GX (Godox Compatible)"
brand: "sekonic"
price: "$699"
currency: NZD
in_stock: true
reviews_count: 5
category: "Sekonic"
url: https://www.desertcart.nz/products/411712052-secondic-exposure-meter-speedmaster-l-858d-dedicated-transmitter-rt-gx
store_origin: NZ
region: New Zealand
---

# Flash time analysis Compact 3.3x2.8x1.1 cm size 2.4GHz wireless control Secondic Exposure Meter Speedmaster L-858D Dedicated Transmitter RT-GX (Godox Compatible)

**Brand:** sekonic
**Price:** $699
**Availability:** ✅ In Stock

## Summary

> ⚡ Master your light, own the moment.

## Quick Answers

- **What is this?** Secondic Exposure Meter Speedmaster L-858D Dedicated Transmitter RT-GX (Godox Compatible) by sekonic
- **How much does it cost?** $699 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nz](https://www.desertcart.nz/products/411712052-secondic-exposure-meter-speedmaster-l-858d-dedicated-transmitter-rt-gx)

## Best For

- sekonic enthusiasts

## Why This Product

- Trusted sekonic brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Streamline Your Workflow:** Stand beside your subject, nail your metering fast, and finish shoots with less stress.
- • **Compact & Lightweight Design:** At just 40g and pocket-sized, it’s the ultimate portable tool for on-the-go pros.
- • **Seamless Godox Compatibility:** Effortlessly integrates with Godox 2.4GHz wireless system for flawless flash control.
- • **Precision Flash Time Analysis:** Measure flash duration wirelessly to perfect your exposure with scientific accuracy.
- • **Wireless Flash & Light Adjustment:** Control your lighting setup remotely, boosting efficiency and creative freedom on set.

## Overview

The Sekonic RT-GX Transmitter Module is a dedicated wireless controller for the L-858D Speedmaster light meter, fully compatible with Godox’s 2.4GHz system. It enables remote flash and light adjustments plus wireless flash time analysis, all packed into a compact, lightweight design that enhances professional photography workflows.

## Description

Sekonic RT-GX Flashpoint Transmitter Module for The L-858D-U SPEEDMASTER

Review: Para poder usarlo, tienes que actualizar tu flash meter, y no es tan sencillo, la barrera del idioma te puede complicar la existencia, pero una ves que lo actualizas, es una chulada su función. Saludos
Review: This device has really streamlined my workflow I can nail the metering while standing beside the subject and get the shoot finished quicker, with less stress and hassle. Its definitely worth having if you have an L858D meter and Godox flash gear

## Features

- Dedicated L-858D transmitter compatible with Godox 2.4GHz wireless system
- Remote control allows flash and light adjustment
- You can also measure flash time analysis wirelessly.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B08KWMLDLG |
| Best Sellers Rank | #87,052 in Electronics ( See Top 100 in Electronics ) #208 in Shoe-Mount Flashes |
| Item model number | 012069 |
| Manufacturer | セコニック |
| Product Dimensions | 3.3 x 2.8 x 1.1 cm; 40 g |

## Images

![Secondic Exposure Meter Speedmaster L-858D Dedicated Transmitter RT-GX (Godox Compatible) - Image 1](https://m.media-amazon.com/images/I/813KUQ6cajS.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ Review
*by J***O on 23 January 2026*

Para poder usarlo, tienes que actualizar tu flash meter, y no es tan sencillo, la barrera del idioma te puede complicar la existencia, pero una ves que lo actualizas, es una chulada su función. Saludos

### ⭐⭐⭐⭐⭐ Review
*by A***Y on 15 October 2024*

This device has really streamlined my workflow I can nail the metering while standing beside the subject and get the shoot finished quicker, with less stress and hassle. Its definitely worth having if you have an L858D meter and Godox flash gear

### ⭐⭐⭐⭐⭐ Review
*by ぴ***ん on 1 July 2025*

スタジオ撮影でGodoxのストロボを使用しており、撮影現場での効率化を図るために購入しました。通常、セコニックのL-858DだけではGodox製ストロボの光量調整ができませんが、このRT-GXトランスミッターを装着することで、露出計から直接光量を調整できるようになります。 実際に使ってみると、測定したその場で光量を変更できるのは非常に便利で、撮影のテンポが格段に向上しました。設定も簡単で、Godoxのチャンネルを合わせるだけで接続でき、反応速度も良好。ボタンを押してすぐに反応するため、ストレスなく操作できます。 一度だけ、トランスミッターが装着されていないと誤認されることがありましたが、差し直すことですぐに復旧しました。ごく稀な事象なので、特に気になるレベルではありません。 他の製品との比較はしていませんが、露出計から純正のように光量をコントロールできる点は大きなアドバンテージです。Godoxとセコニック両方を使っている方には、まさに最適な組み合わせだと感じました。 スタジオ撮影を行っていて、Godoxのストロボをお使いの方には、導入する価値のあるアイテムです。時間短縮と操作の一体感が得られ、撮影フローが確実にスムーズになります。

## Frequently Bought Together

- Sekonic Transmitter Module RT-GX for L-858D-U Speedmaster Light Meter
- Sekonic Speedmaster L-858D-U Light Meter (401-858)

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*Product available on Desertcart New Zealand*
*Store origin: NZ*
*Last updated: 2026-02-28*