Firmware Notice: CN-E45-135mm T2.4 L F: Firmware Version 1.4.0

Firmware version 1.4.0 incorporates the following enhancement:
Adds support for relay kit RL-S2, which converts the image circle from full frame to super 35.

- Firmware version 1.4.0 is for lenses with firmware up to version 1.3.0. If the lens' firmware is already version 1.4.0 or later, it is unnecessary to update the firmware. You can check the firmware version of the lens from the camera’s menu. Please refer to the camera instruction manual for details on how to check the current Firmware Version. Once the lens is updated to the latest version, it cannot be restored to the previous version.
- Please perform the firmware update before replacing the relay kit on the CN-E45-135mm T 2.4 L F (EF mount).
- For PL mount firmware update, please contact CANON U.S.A., INC. and CANON CANADA INC.
- Please prepare a memory card supported by the camera. Please see the camera's instruction manual for details about which memory cards are supported by each camera model.
- Please refer to the instruction manual for the relay kit replacement procedure.

Preparations for a firmware update:
The downloaded folder contains the firmware (file name: CN024104.afu / file size: 2,883,636 byte), and instructions on the firmware update procedures (a PDF file in two languages:English,/ French). Prior to starting the firmware update operations, please be sure to carefully review the instructions to confirm your understanding of the firmware update procedures.

The following items are required to perform this firmware update:

  1. Lens body
  2. A compatible camera* which would be attached to the lens body
  3. Mount adapter (**)
  4. A fully charged battery pack for the camera or a dedicated AC adapter kit (sold separately for EOS R5 C).
  5. A memory card that is compatible with the camera. (Please see the camera's instruction manual for details on which memory cards are supported by each camera model.)
  6. A memory card reader (the card slot of a computer can also be used.)
  7. Firmware update file (The firmware file downloaded from the home page.)

* Cameras compatible with the lens:
EOS C300 Mark III (EF Mount)
EOS C500 Mark II (EF Mount)
EOS C70 (**)
EOS R5 C (**)

** Mount Adapter is required when using an RF-mounted camera. Below are supported mount adapters:
   Mount Adapter EF-EOS R
   Control Ring Mount Adapter EF-EOS R
   Drop-In Filter Mount Adapter EF-EOS R with Drop-In Variable ND Filter A
   Drop-In Filter Mount Adapter EF-EOS R with Drop-In Circular Polarizing Filter A


Download Firmware Version 1.4.0 for the CN-E45-135mm T2.4 L F.

If you have not already done so, please register the CN-E45-135mm T2.4 L F. By registering, we will be able to notify you via email about future announcements.

This information is only for residents of the United States and its five territories only. If you do not reside in the USA or its five territories, please contact the Canon Customer Support Center in your region.

Thank you,
Customer Support Operations
Canon U.S.A., Inc

Canon Customer Support Center
Hours: Monday - Friday 9:00 AM to 5:00 PM EST, excluding Holidays
Phone: 1-855-CINE-EOS (toll free)
TDD: 1-855-270-3277 (toll free)

Support options and hours of operation:

Need help with your product? Let us help you find what you need.
Product Support
Sign up for up-to-the-minute Canon News, Sales and Deals.
Discover great new ways to enjoy your products with exclusive articles, training and events.
Learn more