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Sekonic L-858D-U Speedmaster Light Meter Kit with Transmitter Module for Godox
Improve flash metering efficiency and accuracy with this Sekonic L-858D-U Speedmaster Light Meter Kit with Transmitter Module, which pairs the advanced L-858D-U light meter with the RT-GX Transmitter Module for wireless radio control via the Godox triggering protocol.

Sekonic Speedmaster L-858D-U Light Meter
Aiming to provide for the needs of both photographers and filmmakers, the Speedmaster L-858D-U Light Meter from Sekonic comes packed with a variety of upgraded features and capabilities that make it an almost essential tool for a working professional. It is able to take incident and reflected light readings of both flash and ambient light with an expanded measuring range of -5 to 22.9 EV at ISO 100, or within an illuminance range of 0.1 to 2,000,000 lux. Users will also find it intuitive and easy-to-use thanks to the use of a 2.7" color touchscreen LCD and an all-weather design.

The meter can use either a 270° rotating and collapsible lumisphere or an integrated 1° spot viewfinder to account for varying needs of the user. Also, it offers an extensive range of cinema and video settings as well as the unique ability to measure flash duration and to take readings when using high-speed sync flash. The L-858D-U is equipped with a variety of other functions as well, including memory recall, a Flash Analyzing Function, and extended ranges on nearly every setting. Additionally, through the use of optional modules, users can add radio triggering support for PocketWizard and Elinchrom/Phottix systems.

  • Lumisphere receptor head rotates 90° right and 180° left and retracts for conversion to a flat diffuser.
  • Integrated 1° spot viewfinder with full information display provides a precise method of measuring specific parts of a scene.
  • Ability to measure flash duration within a range of 1/40 to 1/55,500 second using t0.1 to t0.9 settings.
  • Improved sensitivity of the L-858D-U allows it to record a reading at just 0.1 lux illuminance as well as use expanded range of -5 to 22.9 EV for incident readings and -1 to 22.4 EV for reflected light. Also, it features an extended ISO range of ISO 3 to ISO 13,107,200 with an option available for ISO 850.
  • Optional radio modules are available for PocketWizard and Elinchrom/Phottix systems for advanced wireless triggering and remote flash control.
  • High-Speed Sync support allows photographers to accurately take readings while using HSS with their flashes and cameras.
  • Flash Analyzing Function measure ambient and flash simultaneously to provide a percentage of flash in the final exposure. Users can then adjust the mix as the display shows camera settings and the relationship between the flash and ambient light in your exposure.
  • Users can determine the dynamic range of their camera using optional targets by taking bracketed shots with their measurement data and they using the Sekonic Data Transfer Software to graph and then save the information to the meter.
  • Expanded shutter speed ranges now allow for readings between 1/64,000 second to 30 minutes with ambient light and 1/16,000 second to 30 minutes for flash.
  • A comprehensive set of cinema modes allows for settings of 1-1000 fps as well as shutter angles of 1-358°. Twenty user determined settings are also available that provide more precise options of 0.001-360° shutter angles and 0.001-99,999.999 fps.
  • 2.7" color touchscreen LCD provides a fast and intuitive method for viewing and changing settings.
  • Micro-USB port can be used for firmware updates, applying custom settings, and to use exposure profiling.
  • The L-858D-U features an all-weather construction that is dust and splash proof (JIS Class 4).


Sekonic RT-GX Godox Transmitter Module
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.

Box Contains

    Sekonic Speedmaster L-858D-U Light Meter
  • 1 x Anti-Glare Sheet for LCD Screen
  • 1 x Lens Cap
  • 1 x Strap
  • 1 x Soft Case

    Sekonic RT-GX Godox Transmitter Module
  • Limited 1-Year Warranty with 2-Year Extension upon Online Registration

Box Contains

    Sekonic Speedmaster L-858D-U Light Meter
  • 1 x Anti-Glare Sheet for LCD Screen
  • 1 x Lens Cap
  • 1 x Strap
  • 1 x Soft Case

    Sekonic RT-GX Godox Transmitter Module
  • Limited 1-Year Warranty with 2-Year Extension upon Online Registration

BrandSekonic
ModelSekonic 401-858GX
TypeDigital
Meter TypeAmbient Cine Flash Spot
Spot Metering1° Spot
Flash MeteringCordless
Light Reading MethodIncident Reflected
Light ReadingsCandelas per Meter Squared (cd/m²) Foot Lamberts (fl) Footcandle Lux
Measuring ModesAperture Priority FPS Metering Flash Duration Analysis HSS Flash Shutter Priority
Aperture RangeFlash, Incident: f/0.5 to 128.9 at ISO 100 Flash, Reflected: f/1 to 128.9 at ISO 100 f/0.5 to 161.2
EV RangeAmbient, Incident: -5 to 22.9 EV at ISO 100 Ambient, Reflected: -1 to 24.4 EV at ISO 100
ISO Range3 to 13,107,200 (1/3-Step Increments), Plus 850
Shutter Speed Range1/64,000 to 30 Minutes (1, 1/2, 1/3-Step Increments), Plus 1/400, 1/200
Max Flash Sync Speed1/16,000
Cine Speed / Shutter Angle0.001 to 1000 fps at 1 to 358°
Illuminance Range0.1 to 2,000,000 Lux / 0.01 to 180,000 fc
Luminance Range0.3 to 290,000 fL / 0.1 to 980,000 cd/m²
Exposure MemoryYes, 9 Readings
Receptor ElementSilicon Photodiode
DiffuserAdjustable Spherical to Flat
Display2.7 / 6.9 cm Color Touchscreen LCD
System ConnectionPC Sync Terminal Micro-USB Port
Memory Card SlotsNone
Tripod Mounting Thread1/4-20 Female
Operating Temperature14 to 122°F / -10 to 50°C
Operating Humidity0 to 85%
Storage Temperature-4 to 140°F / -20 to 60°C
Storage Humidity0 to 85%
Battery2 x AA (Alkaline, Manganese)
Radio SystemNone
Frequency2.4 GHz
Channels and Groups32 Channels, 16 Groups
Range98.4' / 30 m
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