Hi, SHADF!
Our forums are designed for support and discussion of consumer-level Canon products. For assistance on a broadcast lens such as this one, your best choice for support and service would be to contact Canon's Broadcast and Communication Products division. You can call them at 1-800-423-LENS (1-800-423-5367) where they're available weekdays from 9 AM to midnight ET (6 AM to 9 PM PT), and you can get support via email by clicking HERE.
We hope this helps!
