The EF-EOS M Mount Adapter is required to use this lens with EOS M-series cameras. This mode reduces subject blurring and blurs the background when the lens is mounted on these cameras. Firmware v.2.0.0 (May 2017) adds support for the ‘panning’ scene mode with the EOS M5 and M6.Firmware update 1.0.9 (November 2020) fixes a phenomenon which, in rare cases, causes the IS mechanism to make the image jump.The lens must be sent to the Service Centre in order for this function to be enabled. In addition, this firmware enables a full-time manual focus function during Servo AF when used with the EOS-1D X Mark II.Also improves the image stabilization effect during handheld shooting with a slow shutter speed when used with EOS 5D Mark IV, EOS 6D, or EOS R. The speed when the switch is set to 3 (slowest speed) will be unchanged. Firmware version 1.1.2 (November 2019) increases the manual focus speed when the manual focus speed switch is set to 1 or 2.Firmware v.1.2.0 (April 2016) corrects the problem where, 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.
