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Nissin i-40 not connecting to A7iii

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Hi there - just bought an A7iii. I am trying to get my Nissin i-40 to work with it though and so far - no joy. The flash symbol is not showing in the monitor and no flashes are going off when releasing the shutter. 


Silent shooting is off. The flash gun is set to TTL. Camera setting is Manual. External flash is set to "off" as it is mounted on the hot shoe. 

In camera setting is set to Fill Flash. Auto ISO is OFF.

Is it a problem with the hot shoe ? My Nissin is quite old now...maybe 6 years old...


It IS firing in Manual mode on the flash gun however...


Many thanks,





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