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EF 40mm f2.8 STM lens firmware update

Firmware version 1.2.0 for the EF 40mm f2.8 STM lens addresses the phenomenon where, if pressure is applied to the lens barrel while the lens is mounted to the camera (or if the lens is placed and carried around in a bag with the lens cap attached), the autofocusing function of the lens may stop working. Without the firmware upgrade the issue can be resolved by removing and reattaching the lens.

Firmware version 1.2.0 is for lenses with firmware version 1.1.0. The lenses with the following serial numbers were supplied with firmware version 1.1.0 installed:
- the third digit in the serial number is either 0, 1, or 2 (xx0xxxxxxx、xx1xxxxxxx、xx2xxxxxxx).

Lenses with serial numbers other than those listed above already have firmware version 1.2.0 installed.

The lens firmware is updated by attaching the lens to an EOS-1D X, 5D Mark III or 650D. The downloaded firmware file is copied to a CF or SD card which is inserted into the camera before running the update procedure.

A detailed firmware update procedure is supplied as a PDF document with the firmware download.

If you do not own any of the cameras listed above, but wish to have the lens firmware updated, contact a Canon Service Centre.

>>more information and download


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