18-300mm B061 Firmware Canon RF: Important Fix

The 18-300mm B061 firmware Canon RF update addresses an operational stability issue affecting the TAMRON 18-300mm F/3.5-6.3 Di III-A VC VXD (Model B061) when used with certain Canon RF-mount cameras.

TAMRON released firmware Ver. 2 on October 30, 2025 to resolve the issue. The update improves operational stability when the lens is used with the Canon EOS R5 Mark II and Canon EOS R1.

Canon RF users of the B061 should check the firmware version currently installed on their lens and update to Ver. 2 if an earlier version is installed.

18-300mm B061 Firmware Canon RF: What’s Fixed?

The latest firmware improves the operational stability of the Canon RF-mount B061 when used with the Canon EOS R5 Mark II and EOS R1.

The issue was identified after Canon released camera firmware updates for these camera models in July 2025. TAMRON subsequently investigated the compatibility problem and released lens firmware to address it.

The affected camera firmware versions were:

• Canon EOS R5 Mark II — Ver. 1.1.1

• Canon EOS R1 — Ver. 1.1.2

The corresponding TAMRON lens solution is B061 firmware Ver. 2 for Canon RF.

Firmware Information

TAMRON’s official firmware database currently lists Ver. 2 as the latest Canon RF firmware for the B061.

Why Was the B061 Firmware Updated?

On September 30, 2025, TAMRON announced an incompatibility issue between the Canon RF version of the 18-300mm B061 and the Canon EOS R5 Mark II and EOS R1.

The issue appeared when the affected cameras were updated to their respective firmware versions released in July 2025.

TAMRON initially announced that it was investigating the cause. On October 30, 2025, the company announced that the lens issue could be resolved through a firmware update.

This makes the B061 lens firmware particularly important for Canon RF users who own either of these camera bodies.

Canon EOS R5 Mark II Compatibility

The Canon EOS R5 Mark II was one of the cameras affected by the compatibility issue.

The issue occurred after the camera was updated to firmware Ver. 1.1.1.

TAMRON’s subsequent B061 Ver. 2 firmware improves operational stability when the lens is used with the camera.

If you use the 18-300mm B061 with an EOS R5 Mark II, check the lens firmware before shooting with the updated camera.

Canon EOS R1 Compatibility

The Canon EOS R1 was also affected.

The issue occurred after the camera was updated to firmware Ver. 1.1.2.

TAMRON firmware Ver. 2 for the B061 addresses the lens-side compatibility problem and improves operational stability with the EOS R1.

Canon RF users who have both the EOS R1 and B061 should therefore make sure that the lens is running the latest firmware.

How to Update the 18-300mm B061

The Canon RF version of the B061 can be updated using TAMRON Lens Utility.

TAMRON’s official firmware page provides the firmware information and directs users to the appropriate TAMRON Lens Utility software for the update.

Before starting the update, make sure that the computer meets the software requirements and carefully follow the instructions provided by TAMRON.

Before Updating

We recommend the following steps:

1. Confirm that your lens is the 18-300mm F/3.5-6.3 Di III-A VC VXD (Model B061).

2. Confirm that it is the Canon RF-mount version.

3. Check the firmware version currently installed on the lens.

4. Install the latest compatible TAMRON Lens Utility software.

5. Connect the lens according to TAMRON’s instructions.

6. Make sure the connection remains stable during the update.

7. Follow the firmware installation instructions carefully, please click here.

8. Do not interrupt the update while it is in progress.

TAMRON states that once a lens has been updated to a new firmware version, it cannot be downgraded to an older firmware version.

Check the B061 Firmware Version

Before installing an update, check the firmware version currently installed on the lens.

If your Canon RF B061 is already running Ver. 2, no further update is required for the compatibility issue covered by this notice.

If the lens is running an earlier version, TAMRON recommends updating to the latest available firmware.

The official TAMRON firmware page currently identifies Ver. 2 as the latest firmware for the Canon RF B061.

TAMRON Lens Utility for Canon RF

The Canon RF version of the B061 supports firmware updates through TAMRON Lens Utility for PC.

This is particularly useful for Canon RF and Nikon Z versions of the lens because the latest firmware can be installed without relying on a camera-body firmware update process.

TAMRON’s B061 product page confirms that the Nikon Z and Canon RF versions can be updated using the dedicated TAMRON Lens Utility application. Firmware updates are not supported through the mobile version of the application.

Users should therefore use the appropriate PC version of TAMRON Lens Utility when updating the B061 firmware.

Important Firmware Information

Firmware updates can change the way a lens communicates with a compatible camera.

For this reason, users should always verify the correct lens model and mount before downloading firmware.

For the service notice covered by this article, the correct lens is:

18-300mm F/3.5-6.3 Di III-A VC VXD (Model B061) — Canon RF mount

Do not use firmware intended for the Sony E, FUJIFILM X or Nikon Z versions.

TAMRON lists separate firmware versions for the different B061 mounts. The current database shows:

The Canon RF version is specifically identified as Ver. 2 with an October 30, 2025 release date.

18-300mm B061 for Canon RF

The TAMRON 18-300mm B061 is an all-in-one zoom designed for APS-C mirrorless cameras.

On Canon RF-mount APS-C cameras, its 18-300mm focal-length range provides a full-frame equivalent of approximately 28.8-480mm.

The lens covers wide-angle through ultra-telephoto perspectives in a single lens.

This makes it useful for a wide range of subjects, including:

• Landscapes

• Travel

• Everyday photography

• Portraits

• Wildlife

• Birds

• Sports

• Family and kids’ events

The B061 also features VXD autofocus and VC image stabilization. Its maximum magnification ratio reaches 1:2 at the wide end, providing useful close-up capability.

Key Features of the B061

The 18-300mm B061 combines several features designed for versatile APS-C photography.

16.6x Zoom Range

The 18-300mm range provides a 16.6x zoom ratio, allowing photographers to move from wide-angle compositions to 300mm super-telephoto framing without changing lenses. TAMRON describes it as an all-in-one zoom covering wide-angle through ultra-telephoto perspectives.

VXD Autofocus

The lens uses TAMRON’s VXD linear motor focus mechanism for high-speed and high-precision autofocus.

This is useful for subjects ranging from everyday photography to animals, birds and sports.

VC Image Stabilization

The B061 also features TAMRON’s VC (Vibration Compensation) system.

VC helps reduce the effects of camera shake, particularly when shooting at longer focal lengths or in lower-light situations.

1:2 Close-Up Capability

At the 18mm wide end, the lens can achieve a maximum magnification ratio of 1:2.

This gives the all-in-one zoom useful close-up capability in addition to its wide focal-length range.

Why the Firmware Update Matters

The B061 is designed to cover many photographic situations with a single lens.

That versatility makes reliable camera-lens communication particularly important.

For Canon RF users with an EOS R5 Mark II or EOS R1, installing the latest lens firmware helps ensure improved operational stability with the camera bodies identified in TAMRON’s service notice.

The update is therefore recommended for users who are still running an earlier B061 firmware version.

Current Canon RF Firmware Status

As of the latest official TAMRON information, Ver. 2 is the latest firmware for the 18-300mm F/3.5-6.3 Di III-A VC VXD (Model B061) for Canon RF.

The update was released on October 30, 2025 and improves operational stability when the lens is used with the Canon EOS R5 Mark II and EOS R1.

Current Firmware at a Glance

What Canon RF Users Should Do

If you own the Canon RF version of the 18-300mm B061:

1. Check the current lens firmware.

2. If the lens is running an earlier version, download the latest B061 Canon RF firmware.

3. Install the update using TAMRON Lens Utility.

4. Follow TAMRON’s official installation instructions.

5. Test the lens with your Canon camera after completing the update.

Users with an EOS R5 Mark II or EOS R1 should pay particular attention to this update because those camera models are specifically identified in TAMRON’s compatibility notice.

Conclusion

The 18-300mm B061 firmware Canon RF update is an important service update for Canon RF users.

Firmware Ver. 2, released October 30, 2025, improves operational stability when the TAMRON 18-300mm F/3.5-6.3 Di III-A VC VXD is used with the Canon EOS R5 Mark II and EOS R1.

If your Canon RF B061 is running an earlier firmware version, check the current version and update the lens using TAMRON Lens Utility.

Keeping the lens firmware current helps maintain reliable communication and operation with compatible Canon RF camera bodies.