Sekonic Speedmaster L-858D-U Light Meter


Available on back-order

  • Incident Metering for Ambient & Flash
  • 1° Spot Metering with Viewfinder
  • Measuring Range: -5 to 22.9 EV (ISO 100)
  • Illuminance Range: 0.1 to 2,000,000 lux

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Available on back-order

This item: Sekonic Speedmaster L-858D-U Light Meter

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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).
SKU: 401-858 Category: Tag:
Weight .240 kg
Dimensions 26 × 15 × 12 cm


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LM Aperture Range

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

LM Battery

AA (Alkaline, Manganese) X 2

LM Cine Speed

0.001 to 1000 fps at 1 to 358°

LM Diffuser

Adjustable Spherical to Flat

LM Display

2.7" / 6.9 cm Color Touchscreen LCD

LM EV Range

Ambient, Incident: -5 to 22.9 EV at ISO 100, Ambient, Reflected: -1 to 24.4 EV at ISO 100

LM Exposure Memory

9 Readings

LM Flash Metering


LM Illuminance Range

0.1 to 2,000,000 lux / 0.01 to 180,000 fc

LM Interface

Micro-USB Port, PC Sync Terminal

LM ISO Range

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

LM Light Readings

Candelas per Meter Squared (cd/m²), Foot Lamberts (fl), Footcandle, Lux

LM Luminance Range

0.3 to 290,000 fL / 0.1 to 980,000 cd/m²

LM Max Flash Sync Speed


LM Measuring Modes

Aperture Priority, Flash Duration Analysis, FPS Metering, HSS Flash, Shutter Priority

LM Memory Card Slots


LM Radio System


LM Reading Method

Incident, Reflected

LM Receptor Element

Silicon Photodiode

LM Shutter Speed Range

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

LM Spot Metering

1° Spot

LM Tripod Mounting Thread


LM Type

Ambient, Cine, Flash, Spot

LM Wireless Connectivity



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

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