Firmware Version 1.0.8 incorporates the following fix.
1. Fixes a phenomenon in which captured images may become overexposed when using the camera's built-in flash or an external Speedlite in combination with the lenses listed below:
- EF300/4 L IS USM
- EF28-135/3.5-5.6 IS USM
- EF75-300/4-5.6 IS USM
- EF100-400/4.5-5.6 L IS USM