The manual does a decent job explaining.
Here goes mine.
Sttl. Looking at the yellow lines on the dial follow the plus and minus signs for more light or less light. Turn to the right for less light.. Turn to the left for more light.
See the M-6 and - 0.5?
It means M (manual) - 6 stops and - 0.5 stop. Here is how I explain it. Hope u can understand. If we say FULL strobe power is 0. Then - 0.5 is closest to 0 and - 6 is further away then 0. Hence - 0.5 is the brightest light u can get out of manual strobe mode and - 6 is the smallest light u can get out of manual strobe mode. Now. If u compare to how Sttl works... U would see that the are turning in different direction to turn power up or down...
I saw this company has it... It's not listed in their website... But certainly seen it on their Facebook page today... U can write them an email... http://www.fun-in.com.tw
They have a few location in Asia. Probably that is your biggest cost...
I have own d1 and z240. Never flooded anyone of them. I have been taught right at the beginning to check the oring and what to look out for. It's quite common sense really. Most of the cases I seen flooding happen is due to user neglect.
I think it's common... TTL mode has been miss more then hit for me. I do also find it giving me more light then needed. Check with a friend and the saying is that it's better to shoot in manual.
With regards to things happening really fast. Then it's a matter of knowing the strobe and distance from subject. Plus. Doing test shots.. Esp for wide angle. For Marco.. Usually have more time...
Fortunately You need to turn it a bit more than 1/4 turn to flood the camera. During my first dive I turn it almost 1 turn when I realized that there is something wrong. Then I try silver tape - doesn't work to keep it. With this port as the user of aqupazza I already decided that I have to forgot about exchange lenses underwater. Especially If I have Inon UWLH100 plus Dome unit, which is quite heavy and it is a bit difficult to unscrew the lens with one hand and try to keep port with second one. I did this few times, just to flood the space between lens and housing, but now I am doing that on land, before diving, and feel much more comfortable, without stress
i myself also hate screwing the lens in and out... i think i have the best solution... i find from this company..