Canon EOS-1D Mark IV Firmware Version 1.1.3
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Canon has released a firmware update for its EOS-1D Mark IV digital SLR camera. Version 1.1.3 incorporates the following improvement and fix:
Enables the central AF point to autofocus when the camera is used with the EF 200-400mm f/4L IS USM Extender 1.4x lens and a teleconverter whose combined maximum aperture is f/8.
- Fixes a phenomenon in which abnormal images may result when continuous shooting mode is enabled and the image size is set to "RAW" or "RAW+JPEG".
Website: Canon EOS-1D Mark IV Support