deeper thoughts
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Hi can you answer a question?There are a number of ways it can work.
While triggering a manual strobe off a TTL one will not give good results, the reverse is possible - Sea & Sea strobes have slave connectors in the front, so you can run a fiber optic cable from the camera to your YS-02, and from there to YS-01 operating in TTL slave mode. This way, when you want to adjust strobe power, you only have one knob to turn on the YS-02, and the other strobe will follow its setting.
Alternatively, you can run both strobes in manual mode while shooting wide-angle, where TTL is less desirable anyway (short burn time on camera pop-up flash limits output of TTL strobes, cameras struggle to evaluate proper exposure with lots of water in the shot), and use the YS-01 alone on macro dives, where a single strobe should be sufficient and TTL helps you avoid blowing out highlights.
A TTL-capable strobe is also a stepping stone towards a TTL-capable pair - if you decide that you prefer TTL over manual, at least in some situations, you may end up selling the YS-02 and buying another YS-01 or YS-03, and possibly a LED TTL converter.
I shoot the strobe in to but control the power output.
Is that actually doing anything or does Ttl override that.
Thnx