Canon released firmware updates for almost every DSLR released before 2015. It’s because many Canon DSLRs have issues with the EF 70-300mm f/4-5.6 IS II and EF-S 18-135mm f/3.5-5.6 IS USM lenses.
The firmware update…
Corrects a phenomenon in which when using the camera with the EF-S 18-135mm f/3.5-5.6 IS USM or EF 70-300mm f/4-5.6 IS II USM lens, even if lens aberration correction is set to “”Enable””, correction will not be applied.
To download the firmware update for your Canon DSLR, click here and then choose your Canon DSLR, and then follow instructions.