Exposure Meters

Sekonic L-858D-U SPEEDMASTER Light Meter



Key Features

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
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 broncolor, Elinchrom, Godox, Phottix and PocketWizard

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Product Overview

Sekonic Speedmaster L-858D-U is the world's first multi-function, multi-brand wireless triggering light meter. It is the first of its kind capable of measuring flash duration and brief flash bursts like you find from HSS (High Speed Sync) for precision flash control.

International Catalog 
International Catalog Info 

JY11 (CE and Canada - Designated L-858D, European Manual)
JY1G (China and Taiwan - Designated L-858D, Chinese Manual)

Measuring System 
Exposure Meter Incident light: Swivel head, lumidisc retractable Reflected light: Switching, 1 deg. spot

Measuring Modes Ambient Light 

T priority, F priority, TF priority, HD_CINE (T priority), CINE (f/s priority), Lux/FC, Cd/m2/FL

Measuring Modes Flash 

Cordless, Cord-in (PC), Radio triggering (with optional transmitters), Multiple cumulative flash, HSS, Flash duration analysis.

Measuring Range (ISO 100) Ambient Incident Light 

-5 to 22.9 EV
0.1 to 2,000,000 lx
0.01 to 180,000 fc

Measuring Range (ISO 100) Ambient Reflected Light 

-1 to 24.4EV
0.1 to 980,000 cd/m2
0.03 to 290,000 fl

Measuring Range Flash Incident Light 

F0.5 to F161.2(=128.9)

Measuring Range Flash Reflected Light 

F1.0 to F161.2(=128.9),

ISO Range 
ISO 3 to ISO 13,107,200 + ISO 850
Aperture Range (Ambient Light) 
F0.5 to 161.2(=128.9) in 1, 1/2, 1/3 step (Analog Scale: F1.0 to F90 in 1/3 step)
Aperture Range (Flash Light) 
F0.5 to 161.2(=128.9) in 1, 1/2, 1/3 step (Analog Scale: F1.0 to F90 in 1/3 step)
Shutter Speeds Range (Ambient Light) 
30m to 1/64,000s in 1, 1/2, 1/3 step (Analog scale: 4s to 1/2,000s in 1/3 step)
Shutter Speeds Range (Flash Light) 
30m to 1/16,000s in 1, 1/2, 1/3 step
Flash Duration Range (Flash Light) 
1/40 to 1/55,500s(25ms to 18us) from 0.1. to 0.9 (in 0.1 steps)
Frame Rate Range (Ambient Light) 
1 to 1,000 f/s plus other 20 settings (customized from 0.001 to 99,999.999)
Shutter Angles Range (Ambient Light) 
1 to 358 deg. plus other 20 settings (customized from 0.001 to 360)
EV Range (Ambient Light) 
Incident light: EV-73.9 to EV103.8 Reflected light: EV-69.9 to EV105.3
Exposure Profile 
Yes (9 times) both incident and reflected light
Contrast/Comparison Function 
Yes (+/-9.9EV in 1/10 step)
Radio System 
Optional Transmitters with RT-3PW - PocketWizard (433MHz), RT-20PW - PocketWizard (344MHz), RT-EL/PX - Elinchrom EL-Skyport/Phottix (2.4GHz), RT-BR - broncolor RFS 2/2.1/2.2 and RT-GX - Godox (2.4GHz)
Flash vs Ambient Analyzing 
Yes (in 10% step)
Filter Compensation 
Yes (--20 to +20EV, preset 30 type)
Exposure Compensation 
Yes (-9.9 to +9.9 EV, in 0.1 step)
Calibration Compensation 
Yes (-1.0 to +1.0 EV, in 0.1 step)
Custom Settings 
Yes (17 custom settings 18 custom settings when transmitter sold separately is installed)

Water Resistance 
Diopter Adjustment 
Yes (-1 to 2.5 D)
Tripod Socket 
Operating Temperature 
-10 to 50 deg. C
Storage Temperature 
-20 to 60 deg. C
Power source 
1.5V x 2 (AA battery), USB bus-power
2.7" color dot matrix touch panel LCD
LCD Backlight 
Weight (lbs.) 
Weight (KG) 
Product Depth Inches 
Product Width Inches 
Product Height Inches 
Product Depth Centimeters 
Product Width Centimeters 
Product Height Centimeters 
Product Metric Weight Grams 

Lens Cap
Soft Case
Start up guide
Anti-glare film
Safety Precaution

Limited 1-Year Warranty with 2-Year Extension upon Online Registration