Service Advisory: EF 50mm f/1.2 L USM


Thank you for using Canon products.

Concerning the EF 50mm f/1.2 L USM interchangeable lens for digital SLR and mirrorless cameras, the following phenomenon has been confirmed.

Customer support for this phenomenon is described below.

We would like to offer our sincere apologies to any users who may have been inconvenienced by this phenomenon.

When shooting in high-temperature environments, the intended exposure level may not be achieved, resulting in fluctuations in the brightness of the images captured in the same scene or an error message (“Err01”) may be displayed.

Affected Product
Certain units of the EF 50mm f/1.2 L USM interchangeable lens for digital SLR and mirrorless cameras that were manufactured in 2022 are affected.



If the first four digits of the 10-digit serial number imprinted on the lens body are “1840”, “1940”, “2040”, “2140”, or “2240” (see image on the right), the lens is affected.

*Units with serial numbers imprinted on the mount are not affected.

Period of Accepting Free Repairs
On or before March 31, 2026


EF 50MM F/1.2 L USM



A free repair service will be offered to users with the affected lenses. Kindly note that we will handle other repair requests as normal repairs. When making a repair request, please bring in your lens body with the lens cap and dust cap attached.

If you have not already done so, please register the EF 50mm f/1.2 L USM. By registering, we will be able to notify you via email about future announcements.

This information is 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.

Still need some help? In order to get more personalized and faster support, we recommend registering your product in your Canon Account.


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