I've recently begun using my Canon DSLR in a Sea & Sea RDX housing (with YS110a and YS1 strobes). I'm getting great results during the day, but I've done a couple of night dives and its not optimal. I'm guessing I need a focus light for the AF. I've tried just using a flashlight or relying on the preflash to give me a little strobe to focus, but it's not working reliably. The flashlight works okay, but gives weird lighting because the TTL balances it out -- in any event, I should get something that attaches to my hot shoe or bracket just for more even lighting. Anyone have any suggestions for me? I've looked at a few and not surprisingly they aren't cheap. I've noticed some either have red gels/lenses and I thought I'd seen IR even, which I guess would allow the AF to work without blasting the scene with light, which would be great too. I'd really like the strobes to light the scene. Anyway, I open to any suggestions. Thanks.