Sekonic L-758D DIGITALMASTER Light Meter


Key Features

Exposure profiling to show your camera's dynamic range and exposure compensation with Data Transfer Software
Full information in 1 degree Spot Viewfinder
Up to nine measured values can be memorized in both Incident and Reflected modes Independently or Combined
Radio Flash Triggering with Optional radio transmitter RT-32CTL compatible with PocketWizard
Flash Analyzing Function
Contrast Function
Dual ISO setting
All weather design

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Product Overview

What moves the L-758D DigitalMaster to the head of the class is that it's the only meter which can be calibrated to read light the way your particular camera system reads light.

Every camera system is unique. Optical, mechanical and imaging components all act on each other to produce slight differences in exposure and the dynamic range of the camera system. Sekonic helps you discover the differences in your camera system and use this information to control light, make better exposures and take better pictures than ever before.

By running an easy calibration test using Sekonic's L-758D, one of Sekonic's Exposure Profile Targets (purchased separately) and the included Data Transfer Software (Mac & Windows), you can accurately profile the characteristics of your camera's imaging system to determine its true native ISO, dynamic range and clipping points.

After processing the test data and determining exposure parameters, the resulting data is uploaded from your computer via the USB cable to the meter, where it is stored as camera profiles. Profiling data from up to three cameras can be stored in your meter for instant recall.

International Catalog Info 

JH31 (CE - Designated L-758D, European Manual)
JH3G (China and Taiwan - Designated L-758D, Chinese Manual)
JH3J (Korea - Designated L-758D, English Manual)

Measuring System 
Exposure Meter Incident light: Swivel head, retractable lumisphere, Reflected light: Switching, 1 deg. spot

Measuring Modes Ambient Light 

T priority, F priority, f/s priority, Lux/FC, Cd/m2/FL

Measuring Modes Flash 

Cordless, Cord-in (PC), Radio triggering (Optional, PocketWizard/EL-Skyport/Phottix), Multiple cumulative flash

Measuring Range (ISO 100) Ambient Incident Light 

-2 to 22.9 EV

Measuring Range (ISO 100) Ambient Reflected Light 

1 to 24.4EV

Measuring Range Flash Incident Light 

F0.5 to F161.2(=128.9)

Measuring Range Flash Reflected Light 

F2.0 to F161.2(=128.9),

ISO Range 
ISO 3 to ISO 8000
Aperture Range (Ambient Light) 
F0.5 to 161.2(=128.9) in 1, 1/2, 1/3 step (Analog Scale: F0.7 to F90 in 1/3 step)
Aperture Range (Flash Light) 
F0.5 to 161.2(=128.9) in 1, 1/2, 1/3 step (Analog Scale: F1.0 to F90 in 1/3 step)
Shutter Speeds Range (Ambient Light) 
30m to 1/8,000s in 1, 1/2, 1/3 step
Shutter Speeds Range (Flash Light) 
30m to 1/16,000s in 1, 1/2, 1/3 step
Frame Rate Range (Ambient Light) 
1 to 360 f/s plus other
Shutter Angles Range (Ambient Light) 
1 to 358 deg. plus other 20 settings (customized from 0.001 to 360)
EV Range (Ambient Light) 
-9.9 to 46.6
Exposure Profile 
Yes (9 times) both incident and reflected light
Contrast/Comparison Function 
Yes (+/-9.9EV in 1/10 step)
Radio System 
Optional Transmitters with RT-32CTL - PocketWizard
Flash vs Ambient Analyzing 
Yes (in 10% step)
Filter Compensation 
Yes (-12 to 12EV, preset 30 type)
Exposure Compensation 
Yes (-9.9 to +9.9)
Calibration Compensation 
Yes (-1.0 to +1.0 EV, in 0.1 step)
Custom Settings 
Yes (17 custom settings)

Water Resistance 
Connectivity with MAC/PC DTS software for firmware upgrades, custom settings andExposure Profiling
Diopter Adjustment 
Yes (-1 to 2.5 D)
Tripod Socket 
Operating Temperature 
-10 to 50 deg. C
Storage Temperature 
-20 to 60 deg. C
Power source 
1.5V x 2 (AA battery)
2.7" color dot matrix touch panel LCD
LCD Backlight 
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 


Data Transfer Software for MAC


  1. Customers who already installed DTS version 5.0 or earlier, before installing new version below, completely remove any previous versions and see this instruction and note.
  2. Please see the Software Guide for installation.
  3. Turn off firewalls and anti-virus programs during the installation process.
  4. Compatible with L-858 series, L-478 series and L-758 series.
  5. If you fail installing the latest Data Transfer Software / Utility Software due to Gatekeeper by Apple inc. Please see this instruction.

APFS Restrictions

Depending on the specification of the APFS file system, file display may not be in alphabetical order. Therefore, when saving multiple images in the same folder, it is difficult to find the necessary image for profile creation. 

Please kindly create a subfolder and manage related images by combining relevant images for each profile. 

Applicable Product

  • Mac Computer Products installed SSD model (mac OS 10.13 High Sierra and later)
  • A Devise formatted as APFS (mac OS 10.12 Sierra and later)

Version 6.0 for OSX 10.15 Catalina compatible with L-858D, L-758 and L-478 series

Download DTS ver. 6.0 for OSX 10.13 - 10.15 (9.7 MB)
Software Guide (4.4 MB)


Sign up for notification of compatibility

Privacy policy: please note that your details will not be passed on to any third parties.


Requirements of Version 6.0

Software Data Transfer Software (this software) 
USB Driver 
OS *1 MAC OS X 10.13
MAC OS X 10.14
MAC OS X 10.15
Models Macintosh with a standard USB interface *2 *3
CPU Intel CPU (compatible with operating conditions of OS) *2
RAM Compatible with operating conditions of OS
Hard disk space Same as above
Display Screen resolution: At least 1024 x 768
Color quality: At least 16-bit

*1 If you are using a Macintosh computer, be sure to use the Macintosh version of the software. Operation of the Windows version is not guaranteed when running in Virtual PC for the Mac.

*2 Intel CPU (except Core 2 Duo and earlier) dedicated. 68k computers and Power PCs not supported.

*3 Please note the following:
     - The operating system must be the one pre-installed on the computer.
     - Proper operation may not be possible on certain Macintosh models and configurations.
     - Proper operation is not guaranteed on a Macintosh with an upgraded operating system
       or an add-on USB interface.
     - Proper operation is not guaranteed over connections through a USB hub.
     -A drive capable of reading a CD-ROM is required to install the software from the CD-ROM.



DigitalMaster L-758 Series Firmware


  1. To update the firmware of your meter, install the Data Transfer Software first.
  2. Please see the Software Guide for installation of Data Transfer Software.

  3. Go to the "Update Setting" tab on the screen of Data Transfer Software, and follow the instructions.

See the Release Note here for firmware version.