Firmware version 1.0.8 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 following lenses: - EF 300mm f4L IS USM - EF 28-135mm f3.5-5.6 IS USM - EF 75-300mm f4-5.6 IS USM - EF 100-400 f4.5-5.6L IS USM The firmware upgrade can be installed by the user. Full instructions and downloads are available at the >> Canon Download Centre
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