In the beginning of a camera's lifecycle, it's not unusual to see frequent firmware updates as early bugs are discovered and fixed. Witness the recent fix to the Canon 5D Mark II.
- Fixes a malfunction that in rare occurrence causes a low battery indication to be displayed when using the EF 85mm F1.2L II USM lens. Depending on the battery check timing of the camera, the battery level displayed on the camera's LCD data panel may shows Battery will be exhausted soon or Battery must be recharged, even though the battery capacity is sufficient.
- Fixes a malfunction that in rare occurrence causes an Err 06 Self Cleaning Sensor malfunction to appear on the camera's LCD monitor and LCD data panel, even when the Self Cleaning Sensor Unit is operating normally.
- Modifies the level of subject brightness that causes the AF-assist beam to fire when using an external Speedlite.
- Enables an external flash connected to the camera's synchro terminal to fire even when the camera's built-in flash is popped up