Canon has issued a firmware update for the Canon EOS-1D X digital SLR camera, enabling AF with lens-teleconverter combinations as slow as f/8. Furthermore during AI Servo AF shooting in low light, viewfinder information is now illuminated, with the AF points blinking intermittently in red, allowing them to be easily confirmed whilst shooting, without affecting the metering of the scene. Firmware update v 1.1.1 is available to download now from the website below.