Canon 5D3 & 430exII - Flash not firing intermittently

Started Aug 31, 2014 | Questions thread
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Canon 5D3 & 430exII - Flash not firing intermittently
Aug 31, 2014

Last night, I was using my 5D3 with a 430exII.  Early on the flash would fire, but the images where as if the flash hadn't fired - ie ambient light only.

Later on in the night, the focus assist beam was only illuminating intermittently.

Batteries where fully charged (and replaced with other fully charged batts, just in case) and camera & flash were both reset, in case I'd accidentally altered a setting.

I then gave up of the 5D and used the same lens and flash (& batts) on a 7D - all worked fine!

So, it looks like an issue with the 5D - the lens contacts appear clean - any ideas?

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Canon EOS 5D Mark III
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