Canon EF 40mm f/2.8 STM Firmware Available

Last updated: May 6, 2025 4:38 am

Published: August 21, 2012

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Firmware Version 1.2.0 addresses the following phenomenon

1. If pressure is applied to the lens barrel while the lens is mounted to the camera (pressure can be applied even while attaching the lens cap or while carrying the camera with the lens attached in a bag), the autofocusing function of the lens may stop working.

A Canon EOS 1D X, 5D III (at v1.1.3 or later) or a Rebel T4i/650D is needed to install the upgrade. Alternatively, the lens can be sent to Canon Service to have the firmware upgrade installed.

Download Firmware 1.2.0

TAGGED:EF 40mm f/2.8 STM firmware

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Craig is the founder and editorial director for Canon Rumors. He has been writing about all things Canon for more than 17 years. When he's not writing, you can find him shooting professional basketball and travelling the world looking for the next wildlife adventure. The Canon EOS R1 is his camera of choice.