07-23-2016 07:15 AM
My Canon 5D Mark III works fine until I connect my Speedlite 430EX II. Here's the exact procedure for duplicating the issue:
Power on 5D MkIII
Power on 430EX II
Press Menu button - Flash fires and no menu comes up
Press Menu button again - Nothing happens
In fact no matter what button I press I can't get anything to come up on the back screen of the 5D.
Even when I power down the 430EX II the menu is still unavailable.
The only way to get the menu back is to power down the 5D MkIII and power back up again. I can still leave the 430EX II connected just not powered up.
If I do power up the 430EX II it immediately fires the flash and the back screen turns off.
I had this issue using firmware 1.2.3 and having just today upgraded to 1.3.3 I am still having this issue.
Has anyone seen this issue before and are there any useful suggestions?
07-24-2016 04:38 AM
I've now done some additional research on this. The problem appears to be with the Canon 5D Mark III and not the Speedlite 430EX II.
I attached my ST-E2 Transmitter and the 5D does the same thing with it attached. Also I took both the 430EXII and the ST-E2 transmitter and tried the same thing on my other camera. It works as expected with both.
So it's clear that the issue lies with the 5D.