Hello,
I changed my Sea & Sea flash for a Inon Z240 and went on holiday to the Red Sea and only had troubles with the Inon. I changed for the TTL possibilities but it seems not to work. I asked around and some say that TTL with Inon does not work well. So I am thinking about changing back. Inon instructions are hard to understand.
The correct setting for TTL is according Inon this.
Main Dial => S-TTL
EV Control Dial => TTL (9 o'clock position)
Advanced Cancel Circuit Swit => Press and lock
And I had much advice from fellow photographers and sales people but everybody gave different advice.
So I am thinking about changing back. So please if there are people with good advice, share it.