for triggers that work only in manual mode. They are compatible with just about anything although you might need to buy extra equipment to make it happen.
For example the gadget infinity triggers have hot shoes on them so any hot shoe flash works, but the pocket wizards use pc sync cables to trigger the flash, not all flashes have pc sync ports on them, for example none of the pentax flashes do, so to get around that you need to buy a hot shoe with pc sync port on it, a little gadget that goes on the flashes hot shoe and gives it a pc sync port where you can connect the pocket wizard
for triggers that actually relay automatic exposure information, then the compability comes into effect and you need to buy the right one, but most of these only support canikon.
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