I managed to find time to locate the disc I made of my first dive with the Fuji S2. These shots which I considered useless due to what I considered severe under-exposure have actually produced quite nice blues in the brighter areas, with little more than some "curves" adjustments in photoshop. However, I would like to see more detail in the shadow areas. Any more increase in the curves started washing out the fan.
I have included one example, not a very good shot, but the blues are much better.
These original shots were made using James's recommendations of 1/125th shutter speed and F22. Thanks James!
On my next Guam visit in November, I will re shoot similar images, while experimenting to find the best balance between nice blue water and adequate shadow detail. For these shots I may try using different strobe power settings for full (with diffuser) for the model due to the greater distance and 1/4 for the seafan(less than 1 meter). This will require a lot more shooting as I will have to adjust the strobe much more depending on the position of the model in relation to the fan but with digital bottom time is more of a concern than available images.
Kindest regards
Chris