Sekonic FLASHMATE L-308X-U

Other manuals for Sekonic FLASHMATE L-308X-U

Startup Guide4 pages

Questions and Answers

C
cwrightAug 8, 2025
Why do displayed shutter speed and aperture values on my Sekonic FLASHMATE L-308X-U Measuring Instruments not match my camera's settings?
- J
  Jerome LiAug 8, 2025
  If the displayed shutter speed and aperture values on your Sekonic Measuring Instruments don't match your camera's settings, ensure that the display steps for the light meter are set to match your camera's settings. Adjust the custom settings to select the correct increments of shutter speed and aperture to align the light meter and camera.
J
John CastilloAug 14, 2025
What to do if the EV is not displayed on my Sekonic Measuring Instruments?
- J
  Jeffrey MartinezAug 14, 2025
  If your Sekonic Measuring Instruments aren't displaying the EV, it might be because you're not using a Measuring Mode that supports EV display. The EV is displayed during ambient light measurements in PHOTO Mode. Ensure that you are using a Measuring Mode which displays the EV value.
W
wrightcodyAug 21, 2025
Why does measured value on my Sekonic Measuring Instruments not look correct?
- S
  smithkarenAug 21, 2025
  If the measured value on your Sekonic Measuring Instruments doesn't seem correct, it could be due to the Lumisphere not being in the intermediate position, which alters the light distribution characteristic. Slide the Lumisphere mounting plate to fix it firmly. Also, ensure that the Measuring Mode is correctly set for the type of light you are measuring. For instance, don't measure flash light in Ambient light mode; check if the correct Measuring Mode is selected.
C
Craig JenkinsAug 27, 2025
How to fix a Sekonic Measuring Instruments that doesn't turn on?
- E
  Emily PerezAug 27, 2025
  If your Sekonic Measuring Instruments won't turn on and there's no display, ensure that you press and hold the power button for more than one second. Check if the batteries are installed properly, paying attention to the (+/-) orientation. If the batteries are dead, wipe them with a dry cloth. Also, verify that you're using the correct type of batteries.
S
sullivanbrianSep 1, 2025
Why can't I set the shutter speed on my Sekonic Measuring Instruments?
- D
  Debra McdonaldSep 1, 2025
  If you cannot set the shutter speed on your Sekonic Measuring Instruments, even within the setting range, and you're in HD CINE Mode, it's because shutter speeds cannot be set lower than the selected frame rate. For instance, if the frame rate is set to 15 f/s, the shutter speed can only be set up to 1/15 s. To resolve this, select a lower frame rate in HD CINE Mode to set the desired shutter speed.

Summary

Safety Precautions

WARNING

Dangers of suffocation from straps and small parts, and battery hazards.

CAUTION

Risks of electric shock, product damage, and injury from improper handling and strap use.

NOTICE

1. Parts Designation

1-1 Parts Designation

3. Before Use

3-2 Inserting the Batteries

Step-by-step guide for correctly inserting AA batteries into the device.

3-3 Power ON;OFF

4. Basic Operation

4-1 Basic Measurement Workflow

Outlines the general steps for performing a light measurement.

4-2 Incident and Reflected Light Measurement

Explains how to set up and perform incident and reflected light measurements.

4-3 Select Display Mode

4-4 Select Measuring Mode

Guide to selecting different measuring modes like PHOTO, HD_CINE, and CINE.

4-5 Setting ISO Sensitivity

Procedure for setting the ISO sensitivity on the light meter.

5. Measurement

5-1 PHOTO Mode

Details operations for exposure settings in PHOTO mode, including ambient and flash measurements.

5-1-1 Shutter Speed Priority Mode

How to use Shutter Speed Priority mode for ambient light measurements.

5-1-2 Aperture Priority Mode

How to use Aperture Priority mode for ambient light measurements.

5-1-3 EV Mode

5-1-4 Cordless Flash Mode

Instructions for measuring flash brightness without a sync cord connection.

5-1-5 Cord Flash Mode

Guide to measuring flash exposure using a synchro cord connection.

5-2 HD_CINE Mode

Operation for exposure settings in HD_CINE mode for video cameras.

5-2-2 Frame Rate Setting

How to set the frame rate in HD_CINE mode for video recording.

5-2-3 Simplified Illuminance Mode

5-3 CINE Mode

Operations for exposure settings in CINE mode for film and video cameras.

5-3-2 Shutter Angle Setting

5-3-3 Simplified Illuminance Mode

5-4 Measuring Contrast of Light

5-5 Out of Display Range; Measurement Range

Explains how to handle readings that exceed the meter's display or measurement range.

6. Advanced Functions

6-1 Custom Setting Function

6-2 Calibration Compensation Function

Procedure for calibrating the meter to match camera specifications or other meters.

7. Various Setting Values

7-2 Shutter Speed

7-3 F-stop (Aperture)

11. Troubleshooting

Power does not turn on

Solutions for when the meter display shows no power or is blank.

Measured value does not look correct

Troubleshooting steps for inaccurate or incorrect measurement readings.

Cannot set shutter speed

Displayed shutter speed and aperture values do not look like cameras settings

Sekonic FLASHMATE L-308X-U Specifications

General

Model	L-308X-U
Light Receiving Method	Silicon Photo Diode
Power Source	1 x AA battery
Measurement Modes	Ambient, Flash
Measurement Range (Ev)	0 to 19.9 EV
Aperture Range	f/1 to f/90.9
Shutter Speed Range (Ambient)	1/8000 to 30 seconds
Shutter Speed Range (Flash)	1/8000 to 1 second
ISO Range	ISO 3 to 8000
Display	LCD
Memory Function	Yes
Dimensions	63 x 110 x 23 mm (2.5 x 4.3 x 0.9 in)
Operating Temperature	0 to 40°C
Operating Humidity	0 to 85% (non-condensing)