Sekonic L-308X Flashmate


Sekonic is striving to keep pace with the needs of today’s photographers and videographers that have learned to adapt and move from assignment to assignment. In response Sekonic has introduced the L-308X Flashmate.

The L-308X features three metering modes:

Photo Mode

The L-308X-U offers full exposure control for photographers while 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.


Additional Features:

  • The Lumisphere provides incident light readings for nearly foolproof exposure readings and enables lighting that scene before talent arrives.
  • The Lens is perfect for lighting green screens, adjusting ratios and taking lux and foot-candle measurements. Reflected light readings enable measuring the brightness of subject tones, gray cards, light sources or window light.
  • Lumidisc (optional) Slide the built-in lumisphere to the right and insert the lumidisc (optional) into the provided slot over the light receiver. The L-308X is now ready to measure flat subjects or lighting contrast with precision.

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 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.

For more information on the Sekonic L-308X go to:

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:


  • Ambient Light – Shutter speed priority mode,  Aperture priority mode, EV mode
  • Flash light – Cordless flash mode, Cord flash 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


-Incident light: 2.50 to 190,000lx – 0.23 to 17,000fc

Repeated Accuracy – ±0.1 EV or less

Calibration  Constant

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

– Reflected light metering: K=12.5

Display Range

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

Shutter speed


– 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


– 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


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


Shutter speed

Shutter angle

45, 90, 180, 270, 360 degrees


– 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

Calibration compensation: -1.0 to +1.0EV (in 1/10 step)

Battery: Type-AA 1.5-volt battery

Operating temperature range: 0℃ to +40℃

Storage temperature range: -20℃ to +60℃

Storage Dimensions: approx. 63(W) x 110(H) x 22(D) mm

Storage Weight: approx. 80g (without battery)

Storage Standard accessories: Soft case, Strap, Synchro terminal cap, Startup guide, Safety precaution

Additional information

Weight 0.45 lbs
Dimensions 6.2 × 4.4 × 1.95 in