LA-EA1 Mount Adapter Firmware (version 02) Update for NEX-3, NEX-5, and NEX-C3 

What Does This Do?
This utility updates the LA-EA1 Mount Adapter Firmware to version 02 and adds support for auto focus with Supported A-mount Lenses.
Note: This feature also requires a firmware update for the NEX-3 and NEX-5 cameras.
Applicable Products and Operating Systems (see full list...)

IMPORTANT: This file is only for use with the models identified. Not all models are sold in all countries.

Table of Contents 
Determine if You Need the Update 

This update only applies for LA-EA1 Mount Adapters with firmware version 01. If your firmware version is already Version 02, this update is not necessary.


Check the firmware version:


  1. Attach the LA-EA1 Mount Adapter to the NEX camera and then power on the camera.
  2. Press the Menu button (upper soft key).
  3. At the "Menu" screen, use the Control Wheel to select "Setup", and then press the center button of the Control Wheel.
  4. At the "Setup" screen, use the Control Wheel to scroll to "Version", and then press the center button of the Control Wheel.
  5. The Lens/Mount Adapter firmware version is displayed on the LCD screen.
    Firmware Version Screen
    If the current firmware version is 02 or higher, this update is not needed.
  6. Press the center button of the Control Wheel to close the version number display.
Important Notes 
  • WARNING!!: This utility is only for use with the Sony® LA-EA1 Mount Adapter used with NEX cameras. Do not install this utility with any other model.
  • WARNING!!: This firmware update and any changes incurred by it are permanent. It is not possible to return to a previous firmware version after updating this firmware. By continuing this update process and downloading and updating this firmware, you acknowledge that you are aware and understand that this update cannot be reversed.
  • To use the auto focus function with Supported A-mount Lenses, you must also download and install a firmware update for the NEX-3 and NEX-5 cameras (camera sold separately).
  • This update process requires the following items for proper updating:
    • A computer with:
      • CPU: Intel® processor
      • Available Hard Disk Space: 200 MB or more
      • Installed Memory (RAM): 256 MB or more
      • A USB port.
      • Macintosh® OS X version 10.5 or 10.6.
        Note: The 64-bit kernel is not supported.
    • Camera power supply:
      • When performing the firmware update, use a fully charged NP-FW50 rechargeable battery pack, or the AC-PW20 AC adapter/charger (sold separately).
        WARNING!!: The camera may not operate properly if the power is interrupted during the update.
    • USB cable:
      • Use only the USB cable supplied with the camera.
        IMPORTANT: Update functionality is not guaranteed with any other USB cable.
  • To ensure that no other program interferes with the installation, save all work and close all other programs. The Taskbar should be clear of applications before proceeding.
  • It is highly recommended that you print out these instructions for use as a reference during the installation process.
Supported A-mount Lenses 

The SAM and SSM lenses support auto focus when used with the NEX camera and the LA-EA1 Mount Adapter (sold separately).
Note: This feature also requires a firmware update for the NEX-3 and NEX-5 cameras.

SAM Lenses

  • DT 18-55mm F3.5-5.6 SAM (SAL1855)
  • DT 28-75mm F2.8 SAM (SAL2875)
  • DT 55-200mm F4-5.6 SAM (SAL55200-2)
  • DT 30mm F2.8 Macro SAM (SAL30M28)
  • DT 35mm F1.8 SAM (SAL35F18)
  • DT 50mm F1.8 SAM (SAL50F18)
  • 85mm F2.8 SAM (SAL85F28)

SSM Lenses

  • Vario-Sonnar T* 16-35mm F2.8 ZA SSM (SAL1635Z)
  • Vario-Sonnar T* 24-70mm F2.8 ZA SSM (SAL2470Z)
  • Distagon T* 24mm F2 ZA SSM (SAL24F20G)
  • 70-200mm F2.8 G (SAL70200G)
  • 70-300mm F4.5-5.6 G SSM (SAL70300G)
  • 70-400mm F4-5.6 G SSM (SAL70400G)
  • 300mm F2.8 G (SAL300F28G)

Note: With an A-mount lens attached, the auto focus speed will be slower than when an E-mount lens is attached. It takes approximately 2 to 7 seconds (based on Sony’s measurement standard) and may vary depending on the subjects or brightness of the shooting environments.

Prepare the Camera for the Firmware Update 
  1. Power on the camera.
  2. Press the Menu button (upper soft key).
  3. At the "Menu" screen, use the Control Wheel to select "Setup", and then press the center button of the Control Wheel.
  4. At the "Setup" screen, use the Control Wheel to scroll to "USB Connection" and verify that "Mass Storage" is selected.
    Mass Storage USB Setting
Download and Update the Firmware 
  1. Download the LA-EA1V2_Update1011a.dmg file to a temporary or download directory (please note this directory for reference).
  2. Go to the directory where the file was downloaded and double-click the LA-EA1V2_Update1011a.dmg file.
    Note: Do not connect the camera to the computer yet.
  3. On the desktop, double-click the LA-EA1V2_Update1010a icon.
  4. Double-click the "Firmware Updater" icon.
  5. At the Password prompt screen, enter the Name and Password for the administrative account, and then click "OK".
  6. Connect the camera to your computer using the supplied USB cable.
    Note: The LCD screen on the camera will turn off when it is connected to the computer.
  7. At the "Firmware Updater" window, click "Next".
    Connect the Camera Screen
    WARNING!!: Do not power off the camera or disconnect the USB cable until the update process is complete.
  8. When the updater recognizes the camera connection the following screen is displayed, and the camera screen displays the message, "Follow computer instructions."
    Camera Connected Screen
  9. At the "Firmware Updater" window, click "Next".
  10. When the following screen is displayed, check the version number at the lower left.
    Current Version Screen
    If the current version is "Ver.1", click "Next".
    Note: If the current version is "Ver.2", you do not need this update. Stop the USB connection, click "Finish", then remove the battery or disconnect the AC adaptor briefly, and then power on the camera again.
  11. When the following screen is displayed, Press the center button of the Control Wheel to reset the camera.
    Note: Do not disconnect the USB cable from the camera or the computer.
    Reset Camera Screen
  12. Press the center button of the Control Wheel to reset the camera.
  13. At the "Firmware Updater" window, click "Next".
  14. When the following screen is displayed, click "Run".
    Run the Update Screen
    WARNING!!: Do not power off the camera or disconnect the USB cable until the update process is complete.
  15. When the following screen is displayed, click "Finish".
    Update Complete Screen
  16. The update process starts and the progress bar is displayed on the camera screen.
    Update Progress Screen
  17. The update process is finished when the "Lens update complete." message is displayed on the camera screen.
    Update Progress Screen
  18. Disconnect the USB cable, power off the camera, then remove the battery pack or AC adapter.
  19. Reconnect the battery pack or AC adapter and power on the camera.
Check the Firmware Version After Updating (optional) 
  1. Power on the camera.
  2. Press the Menu button (upper soft key).
  3. At the "Menu" screen, use the Control Wheel to select "Setup", and then press the center button of the Control Wheel.
  4. At the "Setup" screen, use the Control Wheel to scroll to "Version", and then press the center button of the Control Wheel.
  5. The Lens/Mount Adapter firmware version is displayed on the LCD screen.
    Firmware Version Screen
    If the current Lens/Mount Adapter firmware version is 02, the firmware update was successful.
    Note: If the firmware version number is not 02, please download and install the firmware update again.
  6. Press the center button of the Control Wheel to close the version number display.

Download Files

LA-EA1V2_Update1011a.dmg for NEX-3/5/C3
Date: 8/11/2011
Version: 02
Size: 1.56 MB
Download Now