Thank you for Your constant support to Tokina brand.
We found functional issue with Tokina opera 50mm f/1.4 FF (Canon EF mount) and Canon EOS-1D X Mark II combination, that results in exposure problem.
We are asking to Your cooperation in contacting the camera shop where the lens was purchased, or Your local Tokina official distributor for further firmware upgrade procedure.
Should you have any other questions, contact us via contact form.
As a part of Kenko Tokina Co., Ltd., Tokina has an optical manufacturing tradition that dates back to 1950s. Tokina specializes in high-quality lenses for today's digital single lens reflex (DSLR) and mirrorless cameras.
Kenko Tokina Co., Ltd. | Tokina Dept. International Division