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Description
Sekonic Speedmaster L-858D-U Light MeterIncident 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 Aiming to provide for the needs of both photographers and filmmakers, the Speedmaster L 858D U Light Meter
- 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
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).
In the Box
Sekonic Speedmaster L-858D-U Light Meter
- Anti-Glare Sheet for LCD Screen
- Lens Cap
- Strap
- Soft Case
- Limited 1-Year Warranty with 2-Year Extension upon Online Registration
| 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/m� or fl) Flash Light Cord (PC sync terminal) Cordless 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 Illuminance 0.01 to 180,000 fc / 0.1 to 2,000,000 lux Luminance 0.03 to 290,000 fl / 0.1 to 980,000 cd/m� |
| 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 |
| Packaging Info | |
|---|---|
| Package Weight | 1.45 lb |
| Box Dimensions (LxWxH) | 10.2 x 6.5 x 3.7" |
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
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4.5 ★★★★★
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★★★★★ 4
I think so
I can't remember but l think they are good. I don't car keys as much when l remember to take them.
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Reviewed in the United States on November 26, 2025
★★★★★ 5
Pricey
Too pricey
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Reviewed in the United States on May 5, 2026
★★★★★ 3
Not what I thought
Not what I thought would be helpful to me,memory is about the same,haven’t seen any improvement.
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Reviewed in the United States on December 2, 2025
★★★★★ 5
Good Results
I am not a doctor, but I can attest that Qunol Brain Health Focus Plus is working for me. I must confess that I am no spring chicken and was experiencing memory problems that go along with aging. Furthermore, my doctor has me wearing an oxygen tube, and I was worrying about what happens to my brain when something goes haywire in that department. I began to search for an OTC product that might help and noticed that the claims of one product widely advertised on TV were not supported by research while Qunol does have scientific support. I've used the product for several months now and have indeed noticed a decrease in my symptoms. I feel confident recommending the product to others in the same situation.
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Reviewed in the United States on October 22, 2025
★★★★★ 1
Useless
Of all the supplements I've tried, this was the biggest waste of money. I just finished the bottle and honestly can say I gave it a good shot, but really it is as useless for memory as a multivitamin would be. Furthermore so expensive and each dose is 2 hard white pills. I've been using brain supplements since college and literally this is useless.
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Reviewed in the United States on February 6, 2026