Canon Speedlite 600EX-RT Instruction Manual - Page 22
About Auto Zoom Adjustment to Image Sensor Size, About Color Temperature Information Transmission, - specifications
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Using E-TTL II and E-TTL Autoflash in the Shooting Modes About Auto Zoom Adjustment to Image Sensor Size EOS digital cameras have three sizes of image sensors, and the effective focal length of the mounted lens varies depending on the model. This flash automatically recognizes the image sensor size of each EOS digital camera, and automatically adjusts the optimum flash coverage for the effective focal length of the lens in a range of 20 to 200 mm. When mounted on a supported camera, is displayed on the LCD panel. Auto zoom adjustment for image sensor size can be disabled (C.Fn-09/p.98). About Color Temperature Information Transmission This function optimizes the white balance during flash shooting by transmitting the color temperature information to the EOS digital camera when the flash fires. When you set the camera's white balance to or , the function is enabled automatically. See the Specifications in your camera's instruction manual to find out if it is compatible with this function. About AF-Assist Beam When autofocus cannot achieve focus on the subject in low-light or when contrast is low, the built-in AF-assist beam activates automatically to help autofocus.The AF-assist beam in 600EX-RT/600EX is compatible with all EOS cameras' AF points. The AF-assist beam is compatible with 28mm and longer focal lengths and its effective range is shown in the table below. Position Center Periphery Effective Range (Approx. m/ft.) 0.6 / 2.0 to 10 / 32.8 0.6 / 2.0 to 5 / 16.4 20