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Sekonic L-858D-U Speedmaster Light Meter

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  • Multi-function light meter
  • Cutting-edge, flash-measurement technology
  • High-Speed Sync measurement
  • 2.7" Color dot-matrix touch screen
  • Extended ISO range
  • Full HD Cine and Cine Mode

The Sekonic L-858D-U Speedmaster Light Meter utilizes cutting-edge, flash-measurement technology. The multi-function light meter incorporates flash duration measureemnt and the critical flash data needed to calculate proper ambient-flash exposure. The Speedmaster also has the ability to measure High Speed Sync bursts with high precision.

The L-858D includes the essence of the popular L-478D series features and functions that enables photographers to break through the boundaries of ISO sensitivity, flash and ambient shutter speeds, as well as frame rates (f/s) and shutter angles for cinematographers. Increased sensitivity for both incident and reflected-spot sensors in ambient light allows extreme low light level measurements. In addition, the L-858D offers an optional wireless triggering modules now available for Elinchrom, Phottix in addition to PocketWizard brand radio triggering devices. With its 2.7” color touch screen and truly innovative advanced and sophisticated features, the L-858D breaks away towards the next generation of light measurement control.

Flash Duration Measurements
Measuring the flash duration or “burn time” of a flash exposure has always been a critical part of any fast moving subject such as sports, fashion, wildlife and special effect flash photographs. Unfortunately, flash duration meters have always expensive, complicated and additional piece of gear to carry, until now. The SpeedMaster L-858D’s extremely responsive system offers selectable flash duration measurements from t=0.1 to 0.9. Setting flashes to yield the fastest, or the slowest, is now quick, precise and easy.

HSS Measurements
Measuring the stroboscopic bursts of HSS flash to determine accurate flash exposure has always been considered impossible with the traditional meters. The L-858D’s highly responsive measuring system, monitoring the level of HSS output, is a game changer for HSS shooters, especially when shooting with multiple HSS flash units.

Optional Radio Transmitter no for Elinchrom, Phottix as well as PocketWizard
After years of successful development and market popularity with the PocketWizard radio triggering system, Sekonic now offers optional radio trigging modules for L-858D to control Elinchrom EL-Skyport system and the Phottix Strato/II protocol products. Triggering features range from basic flash triggering to multi-zone and channel triggering, power control, modeling light, camera triggering and much more.

Exposure Profiling
Because every digital camera, lens, and software is unique in its capability to capture andprocess light, each can produce differences in the tonal range (dynamic range) and exposureof an image. Knowing the limits of your camera’s capabilities enables making betterexposures with less post-processing, and ensures you’ll get what you see. Sekonic’spioneering Data Transfer Software allows quick dynamic range mapping and camera/metercalibration for the most precise control of light. Create and store up to ten camera exposureprofiles with Sekonic, X-Rite or datacolor brand calibration targets.


  • 2.7” Color dot-matrix touch screen
  • Extended ISO Range ISO 3 to ISO 13,107,200 + ISO 850
  • Expanded Shutter Speed Range 30 min. to 1/16,000s for flash light
  • Expanded Shutter Speed Range 30 min. to 1/64,000s for ambient light
  • Full HD Cine and CINE mode: 1 to 1000f/s and 1 to 358 degree shutter angle
  • Connectivity with MAC/PC DTS software for firmware upgrades, custom settings and Exposure Profiling
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More Information
Product ConditonNew
Type Digital light meter for flash and ambient light
Radio Frequency None
Receptor Element Silicon photo diodes
Receptor Head Incident Light: Lumisphere convertible to flat diffuser, rotates 90° right & 180° left
Reflected Light: 1° spot viewfinder
Measuring Modes Ambient Light
F priority (aperture)
T priority (shutter speed)
TF priority (shutter speed and aperture)
HD Cine (shutter priority, FPS metering, lux, or fc)
Cine (FPS metering, shutter angle setting, lux, or fc)
Illuminance (lux or fc)
Luminance (cd/m² or fl)
Flash Light
Cord (PC sync terminal)
Radio triggering (optional)
HSS Flash (cordless)
Flash Duration Analysis (cord, cordless, or radio)
Measuring Range Ambient Light (ISO 100)
Incident: -5 to 22.9 EV
Reflected: -1 to 24.4 EV
Flash Light (ISO 100)
Incident: f/0.5 to f/128.9
Reflected: f/1.0 to f/128.9
0.01 to 180,000 fc / 0.1 to 2,000,000 lux
0.03 to 290,000 fl / 0.1 to 980,000 cd/m²
Repeat Accuracy 0.1 EV or less (Incident light: from EV-2, Reflected light: from EV1)
0.2 EV or less (Incident light: under EV-2, Reflected light: under EV1)
ISO Range 3 to 13,107,200 in 1/3 steps, 850
Shutter Speed Ambient Light: 1/64,000 sec to 30 min, 1/200, & 1/400 sec, in 1, 1/2, and 1/3 steps
Flash Light: 1/16,000 sec to 30 min, 1/75, 1/80, 1/90, 1/100, 1/200, & 1/400 sec, in 1, 1/2, and 1/3 steps
Flash Duration 1/40 to 1/55,500 sec (25 ms to 18 us)
t0.1 to t0.9
Aperture f/0.5 to f/128.9 (in 1 step)
f/0.5 to f/152.4 (in 1/2 steps)
f/0.5 to f/161.2 (in 1/3 steps)
Frame Rate 1-1,000 fps, and 20 user settings from 0.001-99,999.999 fps
Shutter Angle 1-358°, and 20 user settings from 0.001-360°
EV Range Incident Light: -73.9 to 103.8 EV
Reflected Light: -69.9 to 105.3 EV
Memory Function 9 readings
Connections 1 x PC sync terminal
1 x Micro-USB port
Screen 2.7" / 6.9 cm color touchscreen LCD
Power Source 2 x AA batteries (alkaline or manganese)
Tripod Mount Yes, 1/4"-20
Operating Conditions Temperature: 14 to 122°F / -10 to 50°C
Humidity: 0 to 85%
Storage Conditions Temperature: -4 to 140°F / -20 to 60°C
Humidity: 0 to 85%
Dimensions 3.7 x 6.9 x 1.9" / 94 x 176 x 49 mm
Weight 8.5 oz / 240 g without batteries
WARNING: This product may expose you to chemicals which are known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov
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