Sillago - Definitely give me a shout before you come over. I travel a lot, so I can't commit to be here, but if I am, it would be wonderful to meet up. I love talking about u/w stuff! Email me at
tony@silent-symphony.com before you head over.
Voln - Terrific! I'm firmly of the view that we need to educate people in Asia, so that everyone will care more about not just the ocean, but everything around us. Things have come a long way economically, but we've a bit of catching up to do in terms of knowledge and concern for the environment around us.
Liang - Tips on u/w photography? Aiyah, how much time do you have?! You have all the right equipment, probably no need to invest in anything else for awhile. The set up for your macro sounds ok, and the strobes have enough power for you to close down to f22 or smaller if you are close enough and the strobes are aimed correctly. A slight shift in the aiming of the strobe(s) will mean a dramatic dropoff in the light reaching your subject.
For wide angle, it all depends on the effect you want to achieve. Either one strobe or two can be very effective. You are effectively "painting" light onto subjects underwater and making use of any available light, so each situation calls for different lighting needs. If I were you, I would try to master using one strobe first and getting nice pictures with that, and then deciding whether to invest in a second large strobe. Of course, there's nothing to stop you from using the YS60s also with wide angle shots. Big strobes can be useful, but small ones too. Some of the wide pix in the book I used YS60 and YS30s to light - no one can tell the difference.
If you have time, I have a slide show at Kinokuniya Ngee Ann City on March 2 at 2:00 pm, free of charge. Stop by, and I'll be happy to try to help with any detailed questions you have.
Cheers
Tony