I want a better autofocus system for low light. Low light auto focus is my biggest bane.
I use a 5D so the options are AF on a flash like the 430 or 580. I happen to use the Pocket Wizard TT1 so I don't have a flash on my camera. I could mount a 580 on top of the TT1 but the TT1's top bracket is so weak it breaks, plus the whole mountain of gear is pretty awkward even before my TT1's bracket broke.
I have tried the ST-E2 on top of the TT1 which is lighter weight and smaller profile than the 580 but I've had issues with the my ST-E2 and don't feel like forking out $200+ dollars for simple auto focus and I don't find the auto focus assist that good when it does work.
What I'd actually love is something like an autofocus laser. I've tried with pen light laser and it works way better than either the auto focus on the 580 or the ST-E2 but it's almost impossible to use a laser in one hand and camera in the other. Plus if I put a pattern diffuser over the laser I have a hard time seeing where it's landing event though it still works well for autofocus.
I've debating with the idea of getting some sort of mounting bracket that I can put into the tt1 hot shoe to mount the laser. Even with such a mount there is no clear way to fire the laser.
I've checked all the hotshoe pins for activity when autofocusing, but can't detect anything. I believe instead of a typical circuit connection, the autofocus is sending a bunch of bits that fire autofocus assist on the flash unit.
I am surprised this isn't more of an issue. I've seen people wish that PocketWizard added an auto focus assist to the TT1, which would be awesome, but I'm surprised there aren't some DIY kits out there, or even available gear to help focusing better.