I have a Canon 5D Mark II, and I'm attempting to use a Yongnuo YN-560 III flash off-camera, with a remote trigger.
I'm using the camera in Manual mode, with the following settings: ISO 320, f/7.1, 1 second.
If I use the flash on the hot-shoe, the subject is lit. If I use the flash off-camera, all I get is a black screen - no light, so I suspect this is a sync issue.
To trigger the flash, I have a Yongnuo RF-603 II wireless trigger in the camera hot-shoe, with a shutter cable attaching it to the camera. I'm using this trigger to remotely fire the flash, with the flash in RX mode. The flash fires when I take the photo, but the image is completely black.
Does anyone have any advice as to how I can resolve this sync issue?
I removed the shutter cable. I put the RF-603 II onto the hotshoe and made sure it had the same channel set as the flash. The flash did not fire when I triggered the shutter. When I partially/fully depress the shutter button, the blue light on the back of the flash does turn on, indicating it's receiving the signal, but the flash does not fire at all.
The batteries are fresh in both flash and trigger, replaced them both. Trigger is definitely seated properly, I tried other configurations just to be sure. If I put the trigger on TX, nothing happens; if I put the trigger on TRX, the flash still doesn't fire, but I do get the blue light turning on on the back of the flash unit.