Sekonic L-308X-U Flashmate Light Meter - Demo

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Sekonic L-308X-U Flashmate Light Meter

A legacy of accuracy pocket-sized and exceptionally accurate, the Flashmate L-308X-U light meter from Sekonic is a compact tool for metering both ambient and flash lighting as well as working in video with dedicated Cine and HD Cine modes. Equipped with a sliding lumisphere, the L-308X-U is able to measure ambient light as well as reflected light via a lens with a 40° reception angle. This meter also has a wide metering range; from 0 to 19.9 EV at ISO 100, and can work with flash within a range of f/1.0 to f/90.9 at ISO 100. Repeat accuracy is also important when metering, which the L-308X-U delivers with a rating of <0.1 EV on repeat exposures.

Maximum versatility last year, Sekonic introduced their groundbreaking flag ship light meter, the Speedmaster L-858D-U. By merging functionality for both photography and cinematography into one light meter, Sekonic created a powerful and invaluable tool for image makers of every kind. Now Sekonic is bringing that philosophy to the immensely popular L-308 series with the new Flashmate L-308X-U.

Keeping pace with the demands of modern image creators that move from assignment to assignment, the L-308X-U features three metering modes:

Photo Mode

The L-308X-U offers full exposure control for photographers on-location or in the studio. Measurement data for flash and ambient light readings are clearly displayed on screen, as well as ambient EV measurement. In addition to Shutter Priority Mode, the new Aperture Priority Mode offers photographers care free measurements where depth-of-field is critical.

HD Cine Mode

Gives cinematographers a compact solution for scouting locations or as a quick go-to solution while they are on set. The 308X-U lets users select from a range of frame rates and shutter angles, while measuring accurately, to within one-tenth of a stop. Also, the addition of ISO 850 greatly assists cinematographers by giving them the option of taking measurements in the native ISOs of many of today's professional cinema cameras.

Cine Mode

Designed with the professional in mind, the FLASHMATE L-308X can take on the challenges of digital cinematography. Select from the right combination of frame rates and shutter angles to achieve the exposure control necessary with one-tenth stop accuracy. Truly universal, the FLASHMATE L-308X offers Lux (lx) and foot-candle (fc) readout enabling a quick set up of lighting in a compact, affordable and easy-to use design.
Slide the built-in lumisphere to the right and insert the lumidisc (optional) into the provide slot over the light receiver. The L-308X is now ready to measure flat subjects or lighting contrast with precision.


The Lumisphere provides incident light readings for nearly foolproof exposure readings and enables lighting that scene before talent arrives.


The Lumidisc is perfect for lighting green screens, adjusting ratios and taking lux and foot-candle measurements.

Lumidisc (optional)

Reflected light readings enable measuring the brightness of subject tones, gray cards, light sources or window light.
Now includes ISO 850 the native ISO of some of today’s most popular video cameras.

Illuminated display

Backlight LCD turns on automatically under EV5.

Calibration compensation

Adjust the L-308X-U to your Film or Digital camera’s exposure or matching the L-308X to other hand-held meters. (+/-1.0EV in 0.1 step)

Custom setting

Three custom settings are available to select display mode, increment of measurement and unit of illuminance (lx or fc) to fit to your camera and metering requirements.

Illuminance Measurement

Lux(lx) and foot-candle(fc) display is especially used for cinematogaraphy, theatrical and other applications that require precise control of light source brightness. Either no display, lux or foot-candle is selectable in custom setting.


L-308X-U Flashmate - Technical Specifications        

Type: Digital light meter for ambient and flash light
Light Receiving Method: Incident light and reflected light
Light receiving section: Incident light :Lumisphere, Lumidisc (optional accessory)
        reflected light: Lens (light receiving angle of 40°)
Light Receptor Element: Silicone photo diode

Measuring Mode                                                                                                                                            

PHOTO Mode Ambient Light


        Shutter speed priority mode,
         Aperture priority mode, EV mode

Flash light Cordless flash mode, Cord flash mode

HD Cine Mode Ambient light Shutter speed priority mode,
         Frame rate setting mode,
        Simplified illuminance mode

CINE Mode Ambient light Frame rate priority mode,
        Shutter angle setting mode,
        Simplified illuminance mode

Measuring Range (ISO100)                                                                                                                                             

Ambient light Incident light EV0 to EV19.9

Reflected light EV0 to EV19.9
Flash light Incident light F No. 1.0 to F No. 90.9

Reflected light F No. 1.0 to F No. 90.9
Illuminance Incident light 2.50 to 190,000lx - 0.23 to 17,000fc

±0.1 EV or less

Incident light metering Lumisphere C=340,
        Lumidisc C=250

        light metering

Display Range

ISO Sensitivity
ISO 3 to 8,000 (in 1/3 step), ISO850

Shutter speed

PHOTO Mode Ambient light: 60 sec to 1/8,000 sec
        (in 1/ 1/2 1/3 step)

Flash light: 1 sec to 1/500 sec
        (in 1, 1/2, 1/3 step)
        plus 1/75, 1/80, 1/90, 1/100 sec

HD_CINE Mode Ambient light 1/8 sec to 1/8,000 sec
        (in 1, 1/2, 1/3 step)
        plus 1/24, 1/25, 1/30, 1/48, 1/50,

Frame rate (f/s) 8, 12, 16, 18,24, 25, 30, 32, 48, 50 60, 64, 96, 100, 120, 128 f/s

Aperture F No. 0.5 to F No. 90.9 (in 1, 1/2, 1/3 step)

Flash Shutter speed

Shutter angle 45, 90, 180, 270, 360 degrees

EV Incident light: EV-6.0 to EV27.3
        (in 1/10 step)

Reflected light: EV-6.0 to EV27.3
        (in 1/10 step)


Out of display or
        measurement range
E.u (Exposure Under)or E.o (Exposure Over) indication
Battery power
        indicator display
3 level status icon
Auto power off approx. 4 min after last operation
Backlight LCD Automatic illumination (under EV5)
Custom settings 3 item settings
-1.0 to +1.0EV (in 1/10 step)
Battery Type-AA 1.5-volt battery
        temperature range
0℃ to +40℃
        temperature range
-20℃ to +60℃
approx. 63(W) x 110(H) x 22(D) mm
approx. 80g (without battery)
        Standard accessories

Soft case, Strap,
        Synchro terminal cap,
        Startup guide,
        Safety precaution

  • Sekonic L-308X-U Flashmate Light Meter 
  • Case for L-308 Series Light Meters
  • Strap for Most Sekonic Light Meters (Replacement)
  • Sync Terminal Cap
  • Limited 1-Year Warranty
  • Limited 2-Year Warranty Extension with Online Registration