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430 iii speedlite infra red beam didn't fire in low light situations

secondlevel
Frequent Contributor
I was shooting a birthday event and the infrared beam didn't fire. I had to use my cell phone to create enough light to focus! I found the settings to change online but I am confused. I had another event and the infrared fired. I didn't change anything since my last job!

The article that I read stated that the new 430 model by default is set to prevent the infrared from firing and it will only activate when using the center focus point. I know I need to read the manual. I didn't think it would be that big of a difference upgrading from the 430 ii.

What is going on?
1 ACCEPTED SOLUTION

TTMartin
Respected Contributor

The IR focus assist will only work in One Shot AF mode. If you are using AIServo it wont.

View solution in original post

3 REPLIES 3

http://photo.stackexchange.com/questions/71916/why-isnt-infrared-af-assist-beam-the-default-when-ava...

John Hoffman
Conway, NH

1D X Mark III, Many lenses, Pixma PRO-100, MX472, LR Classic

TTMartin
Respected Contributor

The IR focus assist will only work in One Shot AF mode. If you are using AIServo it wont.

View solution in original post

secondlevel
Frequent Contributor

I want to say thanks for the reply. I can't recall if I changed it to continous focus; however, it explains why it might not have fired.