The Sekonic Speedmaster L-858D-U Light Meter is the definitive professional metering accessory for photographers and filmmakers who demand absolute accuracy. With an extraordinary measuring range of -5 to 22.9 EV at ISO 100 and an illuminance span of 0.1 to 2,000,000 lux, it handles every lighting scenario from near-darkness to blazing sunlight — all controlled through a fast, intuitive 2.7-inch color touchscreen LCD.
Designed for the modern hybrid professional, the L-858D-U combines incident and reflected metering, a precision integrated 1° spot viewfinder, full HSS flash support, flash duration measurement, and a comprehensive suite of cinema and video settings — all housed in a rugged, dust- and splash-proof (JIS Class 4) all-weather body. Optional radio modules expand its capability with wireless triggering for PocketWizard and Elinchrom/Phottix systems.
Key features
- Unmatched measuring range: Captures readings from -5 to 22.9 EV (incident) and -1 to 22.4 EV (reflected) at ISO 100, with sensitivity down to 0.1 lux for extreme low-light accuracy.
- Dual metering capability: Switches seamlessly between a 270°-rotating, retractable lumisphere for incident readings and an integrated 1° spot viewfinder for precise reflected-light measurement of specific scene areas.
- Full HSS & flash duration support: Accurately meters High-Speed Sync flash and measures flash duration from 1/40 to 1/55,500 second, giving flash photographers complete creative control.
- Comprehensive cine & video modes: Supports frame rates from 1–1000 fps and shutter angles from 1–358°, with 20 fully customizable user presets — essential for cinematographers and video professionals.
- Flash Analyzing Function: Simultaneously measures ambient and flash light, displays the percentage of flash in the final exposure, and shows the relationship between the two so you can fine-tune your mix with precision.
- All-weather, future-ready build: JIS Class 4 dust- and splash-proof construction ensures reliable field use, while the Micro-USB port enables firmware updates, custom settings, and exposure profiling via Sekonic Data Transfer Software.
Specifications
| Measuring Range | -5 to 22.9 EV (ISO 100) ambient; -1 to 22.4 EV reflected |
|---|---|
| Illuminance Range | 0.1 to 2,000,000 lux |
| Metering Modes | Incident (ambient & flash), 1° spot reflected, HSS flash, flash duration |
| Spot Viewfinder | Integrated 1° spot viewfinder with full information display |
| ISO Range | ISO 3 to ISO 13,107,200 (ISO 850 optional) |
| Shutter Speed Range | 1/64,000 sec to 30 min (ambient); 1/16,000 sec to 30 min (flash) |
| Cine / Video Settings | 1–1000 fps; shutter angles 1–358°; 20 user-defined presets up to 0.001–360° |
| Display | 2.7-inch color touchscreen LCD |
| Weather Resistance | Dust and splash proof (JIS Class 4) |
| Wireless Modules | Optional radio modules for PocketWizard and Elinchrom/Phottix systems |
Frequently asked questions
Can the Sekonic L-858D-U meter High-Speed Sync (HSS) flash?
Yes. The L-858D-U includes dedicated HSS flash measurement support, allowing photographers to take accurate readings when using High-Speed Sync with compatible cameras and flashes, and its extended shutter speed range covers up to 1/64,000 second for ambient light.
Does the Sekonic Speedmaster L-858D-U work for video and cinema applications?
Absolutely. It features an extensive set of cine and video settings including frame rates from 1 to 1000 fps, shutter angles from 1 to 358°, and 20 user-defined presets with angles as precise as 0.001–360° and frame rates up to 99,999.999 fps, making it ideal for filmmakers.
Can I use wireless flash triggering with the Sekonic L-858D-U?
Yes, through optional radio control modules. The L-858D-U supports add-on modules for both PocketWizard and Elinchrom/Phottix systems, enabling advanced wireless triggering and remote flash control directly from the meter.