Canon has released new firmware for the EF 200-400mm f/4L IS 1.4x. Changes in firmware Firmware Version 1.1.0 is incorporated with the following correction. Corrects a phenomenon in which the subject may not be in focus on some occasions when using this lens with some camera models (*) and performing AF shooting from approximately 3m. Read more......
Published By: Canonrumors - Tuesday, 8 May, 2018