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| p.1 #1 · Canon EF 40mm f/2.8 STM Lens Firmware v1.2.0 update! |
Firmware Version 1.2.0 addresses the following phenomenon.
Download it from Canon's Drivers And Software page.
- 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.
Firmware Version 1.2.0 is for lenses with Firmware Version 1.1.0. If the lens' firmware is already Version 1.2.0, it is not necessary to update the firmware.
The lenses with the following serial numbers are equipped with Firmware Version 1.1.0:
The third digit in the serial number is either 0, 1, or 2 (xx0xxxxxxx, xx1xxxxxxx, or xx2xxxxxxx).
Lenses with serial numbers other than those listed above are equipped with Firmware Version 1.2.0.
Cameras that can be used for the firmware update:
Canon EOS-1D X, Canon EOS 5D Mark III (with v1.1.3 or later), or Canon REBEL T4i/650D.