Ok, trying to do the 'nice camera underwater' thing on a budget, and I found a nice deal on Amazon for a hard case for a canon T2i (which is an old body I still use, and don't care if it dies a horrible watery death).
Seemed like a reasonable risk, so I went with it. And it worked great! After testing and practicing with it, I grabbed a couple of fantasea nano flashes, and the fiber optic flash repeater cable to get them to pop.
I can not for the LIFE of me get them to work reliably. The housing has an area to plug in one end of the fiber, which then goes back to the nano, but unless it's VERY dark, the nano won't always go off. I figured being 35-40ft under water would be dark enough, but apparently not.
My little brain tells me one of these is probably the issue:
1) camera flash on the t2i not transmitting enough light through the housing?
2) bad fiber (i've re-finished/trimmed both ends to make sure there is a good, flat/clean surface)
3) a feature of the nano
4) a problem on any slave I try to use with this camera/housing setup
does anyone have experience with the nano flashes? do they need a good, dark area to work in? Do I need to max out the flash compensation, in order to make sure I get a good, bright flash to trigger it?