Canon USA with Josh Stoner On the Flex Zoom Series Lenses, Shows “Flex Zoom EF-PL and PL-EF Lens Mount Conversion” from how to change mounts for EF to PL, or PL to EF Cinema Lenses find out how without voiding the warranty with the Technology, On the EOS Cinema Models.
From Canon USA:
“The Flex Zoom series of lenses from Canon has been designed for outstanding optical performance rendering beautiful and natural images. You can change lens mounts from EF to PL, or PL to EL, without damaging the lens or voiding the warranty. Watch to learn how to successfully perform the conversion.”