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CMS-XML QuickGuide to Speedlite 600EX-RT Optical Wireless Flash Setup
You can choose whether senderflash firing is ON and contributes to the flash exposure, or OFF and does not. When set to OFF, the senderflash will still use flash pulses to control the receivers, however, these flash pulses will take place before the actual flash exposure, and will not appear in the finished picture . 1. Press Fn Button 4 until Menu 2 displays.
CMS-XML Auto Zoom Adjustment to Image Sensor Size
CMS-XML QuickGuide to Speedlite 600EX-RT Custom and Personal Settings
When flash coverage is set to Automatic <A>, the 600EX-RT will automatically adjust its angle to coverage to match the field-of-view of your lens and image sensor. If you set this C.Fn to 1, the flash will automatically adjust its angle of coverage to match full-frame/35mm format only.