So, I just updated (added to) my 3 Speedlite 500 EX's with 2 600EX-RT's and the on camera controller, since the price seems to be dropping. But, why is the price dropping? I'm planning on getting a 5D MK4 or new 1dx when they come out, and, I now wondering if the new bodies will add something cool that will obsolete the 600 EX-RT's.
I don't think there could be anything added to the bodies that will obsolete the 600EX-RT. Its main strength is the ability to use it off camera.
On the other hand, they may add an integrated trigger that would send the ST-E3-RT to the bone yard. That would be fine by me. Especially if they add an onboard focus assist beam too.
I've got seven 600EX-RTs. I think they will work just fine for several years.
Would a new metering system in the new camera body "E-TTL 3", or whatever, be able to work with the 600 EX-RT?
I have no way of predicting the future.
But I would think the tech would be backwards compatible.
Canon 5D Mark III, Tamron SP 15-30mm f/2.8 Di VC USD, Canon 24-70mm f/2.8L II, Canon 70-200mm f/2.8L IS II, Canon 135mm f/2L, Canon 2X III, Canon 600EX-RT (x7), Canon ST-E3-RT, Flashpoint Streaklight 360ws. Mirror-less Voigtlander VITO CL with a LANTHAR 50mm f/2.8 PRONTO-LK lens.