Having a few of the Yongnuo RF-603 wireless flash triggers, which are manual control only, I was happy to find out Yongnuo had released some E-TTL versions. So I as my birthday was imminent I had to have some.
This is them:
These are wireless flash triggers that can transmit E-TTL information from your camera, to control compatible flashguns such as the Canon 430 EX II, Canon 580 EX II, and Yongnuo YN 565 EX.
Compatible Cameras and flashguns.
Cameras compatible with using the Camera Flash Control menus:
1D III, 1Ds III, 1D IV, 5DII, 5D III, 7D, 40D, 50D, 60D, 450D, 500D, 550D, 600D, 650D, 1000D, 1100D, SX201S, G12
Cameras that can control by camera buttons:
1D, 1D II, 5D, 10D, 20D, 30D, 300D, 350D, 400D
Flashguns that are fully controllable compatible:
Canon 600EX-RT, 600EX, 580EX II, 430EX II, 270EX II, 320EX, Yongnuo YN-568 C
Yongnuo (No HSS) YN-465 C, YN-467 II C, YN-468 II C, YN-565EX C, YN-565 II C
They have three groups, A, B and C, which will be controlled by the camera’s group controls, and 7 channels (yet to test).
The blurb from Yongnuo themselves is quoted below.
Each trigger requires 2 AA batteries.
In normal operation you need one trigger for the camera, as a transmitter, and one for each off camera flashgun.
I’ve yet to test using one as a remote trigger for firing the camera, but I have piggy backed an RF-603 on top of the 622C and remotely triggered the whole lot.
The power switch is accessible when the flash is fitted, which is a step up from the RF603.
It’s dead easy to choose groups with button on the side.
The test button on one in the hand will fire them without firing a frame (yay)!
They have the screw down style lock for keeping them in the hot shoe.
Top and bottom hot shoe mounts are metal.
I have set up a Canon 430 and 580 EX II, and a Yongnuo 565. Each one a different group.
From the camera I can set zoom of the flash, though the 430 on group C (as I had it-images below) wouldn’t zoom, but I think it was something to do with the flash itself.
All flashes zoom to the same zoom, doesn’t seem to be a way round that.
You can change the power ratio of A and B from 8:1 through to 1:8 in steps of 2, so 6:1, 4:1,etc.
C can be flash exposure compensated from – 3 to +3. Compared to the flash on 1 (metered power) that was practically off to over powering both the A and B flashes.
Now to the interesting bit. Out with the RF603s.
A Yongnuo 460 on an RF603 and one more RF603 on top of the 622 on the camera.
All 4 fired. Yay!
This means I can control 3 flash guns from the camera, manually or via E-TTL, and also control more flashguns manually using the RF603 triggers.
For example, I could set two manual flashes up to light a white background on RF603s, and use the YB-622C triggers on key light, fill, and hair light on a subject, controlling the subject lighting as I go, and leaving the background lights as they are.
Add the lead from the RF603 to the shutter input on camera, and another RF603 hand held as a remote shutter release.
Flash!
Everything works!! Woohoo.
The set of flashguns on the YN-622Cs fire, along with the flash on the RF602 trigger.
All in all I am so far very pleased with these units. For me they do not supercede the RF603 set I have, but they vastly improve my set up and compliment the RF603s nicely.
Very happy they have brought these out.
4 of these triggers were £110 on free delivery from UK shipping point of Chinese Ebay merchant, which is a fraction of the cost of pocket wizards for example.
They are available from many sources on Ebay.
My brief star rating (based on initial impression so far).
overall build quality 8x 
ease of use 9x
value for money 10x
features 10x
More information from http://www.hkyongnuo.com:
Last updated Saturday, January 11, 2014
