Canon plans to release updated firmware for the RF 70-200mm f2.8L IS USM lens in January 2020 to fix an identified and reported issue when using the 200mm end of the focal range. The statement, issued by Canon, gives further details as follows:
"It has been confirmed that when using the RF70-200mm f2.8L IS USM to perform AF shooting to capture a subject at close-range with the focus distance approximately set to the tele-end (200mm), the image may become slightly front-focused.
"New firmware with improved focus accuracy is scheduled for release in the beginning of January 2020, and once the preparations are completed, we will post the information on our website."
"It has been confirmed that when using the RF70-200mm f2.8L IS USM to perform AF shooting to capture a subject at close-range with the focus distance approximately set to the tele-end (200mm), the image may become slightly front-focused.
"New firmware with improved focus accuracy is scheduled for release in the beginning of January 2020, and once the preparations are completed, we will post the information on our website."