« on: July 18, 2013, 02:45:29 PM »
Why they removed it on the ST-E3 is baffling.
Not really, the ST-E3-RT is a radio based wireless transmitter, the ST-E2 is a wireless communication device that uses light to transmit information, the ST-E2 has to have a light emitting tube, so enabling AF assist is comparatively easy with no additional hardware costs. The ST-E3-RT, does not need a light emitting tube to fulfill its primary function, radio flash control, adding AF assist is no small job and would necessitate addition hardware and costs.
Not really. The AF assist lamp on the ST-E2 is separate from the xenon flash tube that's used to trigger remote flashes. There's no reason it couldn't have been added to the ST-E3...except to induce people to spend twice as much on a 600EX-RT as a master, if they want an AF assist lamp.