Sekonic L308X-U Flashmate Light Meter

Sekonic L308X-U Flashmate Light Meter
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  • Brand: Sekonic
  • Product Code: Sekonic L308X-U Flashmate Light Meter
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Exceptionally portable and versatile in its design, the L-308X-U Flashmate Light Meter from Sekonic is a versatile meter that blends both photo and video-oriented functions into a single unit. Equipped with a sliding lumisphere, the L-308X is capable of measuring incident or reflected light via a lens with a 40° reception angle. It offers a wide metering range from 0 to 19.9 EV at ISO 100, working with exposure times as low as 1/8000 all the way up to 60 seconds; it also has an equally broad flash range from f/1.0 to f/90.9 at ISO 100.

The L-308X offers three specialized metering modes: a Photo mode for still shooting with aperture and shutter priority, a Cine mode for selecting frame rates between 8-128 fps with one-tenth of a stop accuracy, and an HD Cine mode for those shooting video with DSLR or mirrorless cameras. All these settings can be easily viewed on the backlit LCD display, which can be customized to your liking and automatically lights up when working at 5 EV or darker. Other features include a PC sync terminal and a cordless flash measuring option. The L-308X-U weighs approximately 3.5 oz and runs on a single AA battery.

  • Portable meter for measuring incident and reflected light, features a sliding lumisphere with a 40° reception angle
  • Measuring range of 0 to 19.9 EV at ISO 100
  • Flash measuring range of f/1.0 to f/90.9 at ISO 100; flash can be measured with PC sync terminal connection or cordlessly
  • Remarkably accurate with a rated variance of ±0.1 EV on repeat exposures
  • Exposure times ranging from 1/8000 to 60 seconds
  • ISO 850 available, useful as it matches the native ISO of some video cameras
  • Backlit LCD screen can be customized to display relevant information, automatically lights up under 5 EV
  • Shutter and aperture priority modes available in Photo mode
  • Cine mode allows you to select the frame rate, from 8 to 128 fps, as well as shutter angle with one-tenth stop accuracy
  • Runs on one AA battery

L-308X 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  
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      
  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
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
Tripod Mount None
Display Grayscale Segment LCD
Dimensions (Diam. x Depth) Dimensions 2.5 x 4.3 x 0.9" / 6.4 x 10.9 x 2.3 cm
Memory Card Type None
Technical Data
Specification Measuring Range : Ambient: 0 to 19.9 EV at ISO 100 | Flash: f/1 to 90.9 at ISO 100 Light Reading Method : Incident | Reflected Measuring Modes : Aperture Priority | EV Metering | Frame Rate Priority | Shutter Priority ISO Range : 3 to 8000 (1/3-Step Increments), Plus 850 Shutter Speed Range : 1/8000 to 60 Seconds Diffuser : Spherical Flat Interface : PC Sync Terminal
Type Meter Type : Ambient Flash
Wireless Communication Channels Wireless Connectivity : None
Exposure Control
Shutter Cine Speed / Shutter Angle : 8 to 128 fps at 45 to 360°
Metering Method Flash Metering : Corded Cordless
Max Sync Speed 1/500
Battery Battery : 1 x AA
Operating/Storage Temperature Operating Temperature : 32 to 104°F / 0 to 40°C Storage Temperature : -4 to 140°F / -20 to 60°C
Weight 3.5 oz / 99.8 g

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Tags: Sekonic L308X-U Flashmate, Sekonic, L308XU, L308X