04-18-2018 01:25 AM
04-18-2018 02:26 AM - edited 04-18-2018 01:01 PM
I went through the 430EX III RT manual and discovered that focus assist is set up VERY differently on this flash.
The 270EX II, 320EX and now the 430EX III RT, are the only Canon external flash units that use a "series of small flashes" to aid in focus assist as a default function. Prior to these flash units, only the built-in flash units used this method.
SO.... What you are seeing, and hearing, is indeed normal. I am surprised the Canon reps that you spoke to did not know this.
The 430EX III RT is unique because a “Personal Function” can be used to switch to InfraRed focus assist. But, it is a smaller than normal pattern, and only works with the center AF point.
You also have the option to disable focus assist.