Exposure Meters

Sekonic L-308X-U FLASHMATE Light Meter




Key Features

Incident Metering for Ambient & Flash

40° Reflected Light Metering

Photo, Cine, and HD Cine Metering Modes

Illuminance Measurement

LCD with Auto Backlight under EV5

PC Sync Terminal & Cordless Flash Option

Calibration compensation function

Custom setting

Runs on One AA Battery

See More

3 Modes

Photo Mode, Cine Mode and HD Cine Mode The L-308X-U has three modes with a full range of features for photography in flash and ambient light conditions. Cine Mode giving you full access to shutter angles, as well and lx, and fc measurements, and HD Cine Mode for working with the settings of Mirrorless and HDSLR cinema cameras.

Lumidisc (optional)

Reflected light readings enable measuring the brightness of subject tones, gray cards, light sources or window light

What's in the Box?

Start-up Guide

Strap, Soft case

Downloadable from website:

Operating manual

Limited 1-Year Warranty, with 2-Year Extension upon Online Registration

Small enough to always

have with you.

Small enough to

always have

with you.

Product Overview

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

Keeping pace with the demands of modern image creators that move from assignment to assignment, the L-308X-U Series 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 L-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-U 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-U offers Lux (lx) and foot-candle (fc) readout enabling a quick set up of lighting in a compact, affordable and easy-to use design.

International Catalog 
International Catalog Info 

JE61 (CE and Canada - Designated L-308X, European Manual)
JE6G (China and Taiwan - Designated L-308X, Chinese Manual)

Measuring System 
Exposure Meter Incident light: fixed head, lumidisc removable (Option), Reflected light: Switching, 40 deg. with built-in lens

Measuring Modes Ambient Light 

T priority, F priority, EV, HD_CINE (T priority), CINE (f/s priority), Lux/FC

Measuring Modes Flash 

Cordless, Cord-in (PC)

Measuring Range (ISO 100) Ambient Incident Light 

0 to 19.9EV
2.50 to 190,000 lx
0.23 to 17,000 fc

Measuring Range (ISO 100) Ambient Reflected Light 

0 to 19.9EV

Measuring Range Flash Incident Light 

F1.0 to F90.9

Measuring Range Flash Reflected Light 

F1.0 to F90.9

ISO Range 
ISO 3 to 8,000 plus 850
Aperture Range (Ambient Light) 
F0.5 to 90.9 in 1, 1/2, 1/3 step
Aperture Range (Flash Light) 
F0.5 to 90.9 in 1, 1/2, 1/3 step
Shutter Speeds Range (Ambient Light) 
Photo Mode: 60s to 1/8,000s HD_CINE Mode: 1/8s to 1/8,000s in 1, 1/2, 1/3 step
Shutter Speeds Range (Flash Light) 
1s to 1/500s in 1, 1/2, 1/3 step
Frame Rate Range (Ambient Light) 
8, 12, 16, 18, 24, 25, 30, 32, 48, 50, 60, 64, 96, 100, 120, 128
Shutter Angles Range (Ambient Light) 
CINE Mode: 45, 90, 180, 270, 360 deg.
EV Range (Ambient Light) 
EV-6 to EV27.2
Calibration Compensation 
Yes (-1.0 to +1.0)
Custom Settings 
Yes (3 custom settings)

Operating Temperature 
0 to 40 deg. C
Storage Temperature 
-20 to 60 deg. C
Power source 
1.5V x 1 (AA battery)
B&W, Segment type
LCD Backlight 
Yes (under EV5)
Weight (lbs.) 
Weight (KG) 
Product Depth Inches 
Product Width Inches 
Product Height Inches 
Product Depth Centimeters 
Product Width Centimeters 
Product Height Centimeters 
Product Metric Weight Grams 

Sekonic L-308X-U Flashmate Light Meter

Case for L-308 Series Light Meters

Strap for Most Sekonic Light Meters (Replacement)

Sync Terminal Cap

Safety Precaution

Limited 1-Year Warranty

Limited 2-Year Warranty Extension with Online Registration




Operating Manual

Quick Start Videos