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430ex 3 not firing focus beam on new 5dmk4

echelonphoto
Frequent Contributor

Got new mk4....my focus beam on the 430ex 3   is not firing...it will fire on my 6d's.   I did check the menu to indicate that af assist beam is enabled.

5 REPLIES 5

kvbarkley
Esteemed Contributor

Which menu? The mk4 or the flash?

echelonphoto
Frequent Contributor

I did both menus...as I said...it fires fine on my 6d's. Now I did try my laso transmitter on the mk4 and that fires the beam no problem.

kvbarkley
Esteemed Contributor

I suggest you call Canon.

TTMartin
Respected Contributor

The IR AF focus assist beam will only activate when in One Shot, it will not activate in AIServo.

 

The IR AF focus assist beam will only activate when the camera can not achieve focus without it. 

 

 

echelonphoto
Frequent Contributor

It seems that it will not fire if you are using the precision focus point...also does not seen to fire if the focus point is not in the center.