Firmware v1.2.3 for the Canon EOS 7D corrects two flash-related bugs that affected Speedlite Transmitter ST-E2 and Macro Ring Lite MR-14EX and MT24-EX, while firmware v1.0.9 for the EOS Rebel T2i/550D fixes an error that caused "tone jumps" in some photos shot while Auto Lighting Optimizer was active.

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