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Sekonic L-858D-U SPEEDMASTER Light Meter Kit with RT-GX Transmitter Module for Flashpoint and Godox

SKU: SK401858GX MFR: 401-858GX
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Key Features

  • Master ambient & flash light metering with this Sekonic SPEEDMASTER light meter kit.
  • Get precise exposure readings with incident and reflected light measurement modes.
  • Wirelessly trigger Flashpoint & Godox strobes using the included RT-GX transmitter.
  • Achieve perfect exposure with an extensive ISO range of 3 to 13,107,200 for any shot.
  • The LCD display on this light meter is easy to read, ensuring simple operation.
  • Compact & lightweight design; this Sekonic light meter is easy to carry at just 8.48 oz.
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Q&A

Questions & Answers

Shopper : Does the module work with the Sekonic 358 light meter and can you purchase it separately? I have all flashpoint lights
Shopper : can i use with Aputure flash ?
ERIC M : Does anyone have the freaking firmware for this to make the module actually work?  The manufacturers website is NOT up, so I can't get it from them!

Reviews about this item

Review Summary

2024-04-24T19:59:26

Rated 5 out of 5

This meter will pay for itself over time!

I am so happy I can control each of my flashpoint and godox strobe lights power individually and can trigger them via the flash meter. Saves a lot of time when you need to change the power of just one light or a group of lights. Can measure the real output of high speed sync rather than having to guess. Touchscreen is easy to use and read.

RICHARD D.

2024-04-08T09:41:23

Rated 5 out of 5

Sekonic Lightmeter for Flashpoint

Excellent lightmeter and controller

KIM S.

2024-03-23T08:38:48

Rated 3 out of 5

Do your due diligence researching this product before purchasing!

Perhaps you're looking at the L-858D-U because you read about the custom camera profiling feature and thought that was exactly what you were looking for. That's what sold me on this unit, however, little did I know that it requires the use of a piece of software that can be downloaded from the Sekonic website and that program is no longer being supported apparently. The long and the short of it is that you can download the program and even go through the process of creating a custom profile for your camera, but you won't be able to upload that profile to the meter because the meter won't connect the computer through USB as it is supposed to and all of your time was spent for nothing. The driver that the DTS software installs is for the L-758 meter, which may or may not be part of the issue, and there is no available help or information to solve this issue. Research it for yourself and see. I would've bought a less expensive unit if I had known that the main feature of this unit, for which I purchased it, is useless to me.

Michael C.

2023-05-09T23:53:58

Rated 4 out of 5

Menus are poorly designed and buggy. Some common settings are buried. Touchscreen requires a fingernail.

Touchscreen, is stiff, requires a finger nail. The menus could be a lot better organized. For example if ya just wanna back out one menu level, it closes the whole menu system instead of just backing up. So ya have to start all over and find where you were again. Annoying and unprofessional. Some aperture settings are not settable, based on what t+f steps you have set. So if ya want a 1.2 aperture, ya have to set the t+f step size to 0.5. Otherwise it'll jump from 1.1 to 1.3, then same thing again if ya want a 1.8 aperture, ya have to set the t+f step size back again to 0.3. Ridiculous and cumbersome! Otherwise it works well, good battery life. My Godox radio is fantastic!

JOE S.

2023-04-11T09:04:49

Rated 5 out of 5

Perfect Spot Meter

I was looking for an off-camera spot meter that's accurate and easy to use, and this fit my needs perfectly.

WEICHI W.

2023-01-22T05:31:40

Rated 5 out of 5

Great Light Meter

Great light meter. Exactly what I was looking for. Especially happy that it is now compatible with Broncolor lighting.

Robert N.

2021-07-23T14:38:50

Rated 5 out of 5

Light meter integration with Godox/Flashpoint strobes.

Excellent integration of light meter with Godox lighting. You can control al the lights, ratios, modeling lamp and adjust the ratios as desired. The Godox/Flashpoint remote is just for triggering the lights along with shutter of the camera. Photo shoot workflow has become a breeze.

SRINIVAS G.

2021-07-18T16:57:49

Rated 4 out of 5

NIce

Great meter for Godox users. Pricing could be better.

anthony a.

2021-05-27T09:18:25

Rated 5 out of 5

The best of the best light meter, oh did I mention it's the BEST?(In regards of completely changing your lighting photo world)

Of course when someone told me about light meters and to go buy one, really, do you need to look further? I mean, I purchased this light meter to begin, learn, and grow old with. It IS THE BEST and if you are hinting towards a studio with lighting career, then this is definitely the go to light meter with the functions that set your parameters you want. This will deliver great results whatever you can imagine to throw at it.

michael h.

2021-04-21T12:23:57

Rated 5 out of 5

Good

Good item I love work excelente

Pedro M.

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Sekonic L-858D-U SPEEDMASTER Specifications

General

General

Jump to...
  • Meter Type

    Multi-Function

  • Tripod Mounting Thread

    1/4"-20 Female

  • Display

    LCD

  • Media Card Reader

    No

Metering

Jump to...
  • Light Reading Method

    Incident, Reflected

  • Aperture Range

    Flash, Incident: f/0.5 to 128.9 at ISO 100Flash, Reflected: f/1 to 128.9 at ISO 100f/0.5 to 161.2 (1, 1/2, 1/3-Step Increments) at ISO 100

  • ISO Range

    3 to 13,107,200 (1/3-Step Increments), Plus 850

  • Shutter Speed Range

    1/64,000 to 30 Minutes (1, 1/2, 1/3-Step Increments), Plus 1/400, 1/200

Battery

Jump to...
  • Battery Type

    Alkaline, Manganese

Physical Details

Jump to...
  • Dimensions

    6.93 x 3.7" (17.6 x 9.39cm)

  • Weight

    8.48 oz (240.4g)

  • UPC Code

    4962294012144

Models
Sekonic L-858D-U SPEEDMASTER Light Meter Kit with RT-GX for Flashpoint and Godox
$679.00

$882.70

Save:$203.70 (23%)

In Stock

Sekonic L-858D-U Speedmaster Light Meter
$629.00

In Stock

Sekonic LiteMaster Pro L-478DR-U Light Meter for PocketWizard System
$449.00

$566.00

Save:$117.00 (21%)

Ships from Manufacturer

Usually ships within 1-2 Days

Accessory CompatibilitySekonic L-858D--
Meter TypeMulti-FunctionFlash Meters, Multi-FunctionFlash Meters, Multi-Function
Compatible BrandFlashpoint & Godox--

About Sekonic L-858D-U SPEEDMASTER

FEATURED REVIEWS

Light meter integration with Godox/Flashpoint strobes.

By SRINIVAS G.

Excellent integration of light meter with Godox lighting. You can control al the lights, ratios, modeling lamp and adjust the ratios as desired. The Godox/Flashpoint remote is just for triggering the lights along with shutter of the camera. Photo shoot workflow has become a breeze.

This meter will pay for itself over time!

By RICHARD D.

I am so happy I can control each of my flashpoint and godox strobe lights power individually and can trigger them via the flash meter. Saves a lot of time when you need to change the power of just one light or a group of lights. Can measure the real output of high speed sync rather than having to guess. Touchscreen is easy to use and read.

A groundbreaking addition to your photography toolkit, the Sekonic L-858D-U Speedmaster Light Meter Kit, equipped with an RT-GX Transmitter module, offers a seamless, integrated light metering solution for Godox users. This advanced light meter kit is designed to simplify and enhance your lighting process, whether you're capturing a detailed portrait or analyzing a complex scene.

The RT-GX Transmitter module, a user-replaceable component, fits conveniently next to the batteries in the Speedmaster L-858D Light Meter. This innovative design allows for effortless measurement, control, and analysis of flash characteristics, enabling you to fine-tune your lighting recipe with unparalleled precision.

The Sekonic Speedmaster L-858D-U stands out as the world's first multi-function, multi-brand wireless triggering light meter. It's a pioneer in its ability to measure flash duration and brief flash bursts, such as those found in High-Speed Sync (HSS), providing you with precise flash control.

The L-858D, when paired with the RT-GX transmitter module, offers full radio compatibility. It empowers you to access all 32 channels (1-32), 16 groups (A-F,0-9), and Wireless ID's to remotely trigger your Godox compatible lights from up to 100ft (30 meters) away. This feature also extends to the wireless control of modeling light power.

With the L-858D-U Speedmaster, High-Speed Sync (HSS) flash metering becomes a breeze for Godox users. There's no need to guess your exposure when using HSS. Simply input your ISO and shutter speed, and the meter will handle the rest.

This light meter kit takes flash analysis to the next level. It allows Godox users to measure the percentage of flash in their images accurately, ensuring the perfect balance between ambient and flash lighting. Additionally, it measures flash duration, letting you know the stopping power your lights possess, whether you're capturing the sweat on an athlete or the flowing gown of a fashion model.

In conclusion, the Sekonic L-858D-U Speedmaster Light Meter Kit with RT-GX Transmitter module is a durable, high-quality, professional, reliable, and advanced tool that is compatible with Flashpoint, Godox, and other popular brands of off-camera flashes and lighting equipment. It's an essential tool for photographers seeking to elevate their lighting and image quality.

Sekonic L-858D-U SPEEDMASTER Features

  • Incident Metering for Ambient & Flash
  • 1 Degree Spot Metering with Viewfinder
  • Measuring Range: -5 to 22.9 EV (ISO 100)
  • Illuminance Range: 0.1 to 2,000,000 lux
  • Extensive Range of Cine & Video Settings
  • HSS Flash & Flash Duration Measurements
  • Flash Analyzing Function; Extended Range
  • 2.7" Touchscreen LCD; All-Weather Design
  • Optional Radio Control Modules For PocketWizard Elinchrom and Phottix

Product Documents

User Manual

Key Features

  • Master ambient & flash light metering with this Sekonic SPEEDMASTER light meter kit.
  • Get precise exposure readings with incident and reflected light measurement modes.
  • Wirelessly trigger Flashpoint & Godox strobes using the included RT-GX transmitter.
  • Achieve perfect exposure with an extensive ISO range of 3 to 13,107,200 for any shot.
  • The LCD display on this light meter is easy to read, ensuring simple operation.
  • Compact & lightweight design; this Sekonic light meter is easy to carry at just 8.48 oz.

What's in the box:

  • RT-GX Godox Transmitter Module
  • Lens Cap
  • Strap
  • Soft Case
  • Start Up Guide
  • Anti-Glare Film
  • Sekonic 1 Year Limited Warranty with 2 Year Extension Upon Online Registration