Tamron 150-500mm Lens Firmware Update Boosts AF and a9 III Compatibility

Tamron has unveiled a significant firmware update for its acclaimed 150-500mm f/5-6.7 Di III VC VXD telephoto zoom lens. This crucial upgrade, designated Version 4.00, is set to revolutionize the lens's performance by refining its autofocus capabilities and integrating seamlessly with Sony's latest high-speed cameras, particularly the revolutionary a9 III, even with some expected restrictions.

Tamron's 150-500mm Lens Gets a Performance Boost

On December 4, 2025, Tamron officially rolled out Firmware Version 4.00 for its 150-500mm f/5-6.7 Di III VC VXD (Model A057) lens. This update focuses on two primary areas: autofocus enhancement and expanded compatibility. The autofocus system has been fine-tuned to deliver more stable and precise performance, especially during focal length adjustments. This improvement is particularly beneficial for dynamic shooting scenarios where maintaining sharp focus across varying zoom levels is critical. Furthermore, the lens now offers full support for Sony's cutting-edge a9 III camera, enabling its impressive 120 frames per second continuous shooting mode. However, this ultra-high-speed capability is presently limited to specific focus modes, such as AF-S, DMF, and manual focus, and does not extend to continuous autofocus (AF-C). This detail is important for professionals capturing fast-moving subjects where continuous tracking is indispensable.

Installation of this firmware update is straightforward, accessible directly from Tamron's official support website. Users can easily download and apply the update to their lenses, ensuring they benefit from the latest performance optimizations and compatibility features.

The introduction of Firmware Version 4.00 for the Tamron 150-500mm lens underscores the manufacturer's commitment to continuous improvement and user satisfaction. This update not only refines core functionalities like autofocus but also strategically positions the lens to take advantage of advancements in camera technology, such as the high-speed capabilities of the Sony a9 III. While the limitations in AF-C mode for 120fps shooting are notable, the overall enhancements provide photographers with greater flexibility and precision, ultimately enriching their creative potential.