By the way, that first set of tests above was soon after midday and in extremely clear blue water well offshore at the Burma Banks. So loads of light for the depth and not really typical of the other dive sites in the Andaman.
I did a similar set of tests at 1pm in about 23m at Hin Taleh (Fan Forest Pinnacle) which is further inland in the Mergui Archipelago where the water was much less clear and rather green. Again the shutter was at 1/50 throughout and gain at 0dB except for one test where it crept upto 3dB.
This time the Expodisc performed much better and my favourite of the bunch this time would be the white balance on the Expodisc aimed towards the sun.
Again the three Expodisc results are pretty similar, indicating that it doesn't seem to matter much where you point it, it just refracts and averages the light passing through it.
White balance on the hand is my next favourite but not really green enough considering the conditions. Pretty good again though, and definitely passable if you don't have an Expodisc!
White balance zoomed in on the sun came out too blue and wishy washy for me this time.
White balance on a white fin was truly horrible this time. Much too red. In fact I think I'm basically going to stop using that technique completely as it hasn't impressed in either test. And to be fair, I had to reduce the red on most of the clips in my Reef Life DVD that were balanced that way with my VX2K.
So this time the Expodisc wins it, although I feel a similar result could probably be achieved with exactly the right tone of pink on a slate or fin.
So Shawn, looks like you're absolutely right in saying that the location and conditions play a huge part in whether the Expodisc is a benefit or not.
Dan, I doubt the repair changed the function of my camera. I didn't notice any difference before and after the repair. Likewise I doubt the partial flooding of the Expodisc has changed things much, but I suppose it's possible. Don't really want to seal up the edges yet just in case I decide to sell it.
Again the full res grabs, deinterlaced this time, are on my server
if you wish to download them.
I did some more tests at Richeleu Rock. I'll check them out and post them up if they add anything to the debate.