Yongnuo YN-685 E-TTL Wireless HSS Flash Speedlite for YN622CTX YN560TX RF-603 UK
New function compared with YN600EX-RT is, YN685 has the two built-in Wireless Trigger systems, YN-622C system and RF-603 system, it can receive the wireless trigger signal from YN-622C,YN-622C-TX, YN-560 IV, YN560-TX, RF-603 II, RF-605, so you can trigger more than two off camera flashs in manual mode, TTL mode, multi mode, and even remote control the each group' flash in flash mode, flash output, focal length and focal length synchronization
 
Video for reference:

 
Features
-Completely Compatible with YONGNUO YN622C and RF-603 / RF-603 II Wireless System
YN685 supports respectively receiving wireless triggering signal from YN622C, YN622C-TX, YN560IV, YN560-TX, RF605, RF603II and RF603.

-Remote Control Off-camera Parameters of Each Group
The flash mode, flash intensity, focal length and sync mode (YN622C wireless system only) of the speed-lite in each group can be controlled remotely through YN622C transceiver and YN560IV/YN560-TX.

-GN60@ISO100,200mm
YN685 is a 2.4G wireless speed-lite of high guide number, which supports TTL, M and Multi mode.

-High Speed Sync (HSS)
When HSS function is activated, this speed-lite YN685 can be used with every shutter speed and the maximum sync speed is up to 1/8000s. Note: The camera and transceiver should support HSS function. 

-Ultra fast Charging Recycle System, supporting External Power Supply
The recycling time is 3 seconds when the power output is set to maximum. The recycling time is about 4~5 seconds even this speed-lite is used without using fresh batteries. In addition, you can use the external power supply to meet your higher charging recycle need.

-Supports Auto/Manual Zooming
YN685 supports auto and manual zooming, and the flash coverage can be changed between 20~200mm.

-Supports Sound Prompt Function, Custom Settings (Fn.) and Auto Save Settings

-Equipped with Big Size LCD Display Screen, standard PC Synchronous Interface

Wireless Slave Mode

1. YN622C Wireless System ( there are total 7 channels and 3 groups )
---Remote Control mode: the remote control mode of YN685 is compatible with the master unit is YN622C-TX, the master unit is YN-622C, and the YN-622C has been enabled the remote control mode.
---Mix mode: the remote control mode of YN685 is compatible with the master unit is YN-622C, and the YN-622C has been enabled the mix mode

2. RF-603 / RF-603 II Wireless System ( there are total 16 channels and 6 groups )
---It can receive the wireless trigger signal from YN-560 IV, YN560-TX, RF-605, RF-603 II

3. Multi-flash Wireless Flash Configuration
---Wireless flash of two slave units made up by YN685
---Wireless flash of multiple slave units made up by YN685
-ETTL, M, MULTI Mode
-GN60@ISO100, 200m --- 2.4G wireless speedlite of high guide number
-Power Saving Mode
-Overheat protection
-Modeling Flash
-PC Sync Port
-Automatic Setting Saving
-Clear Settings
-High-speed Sync, Second-curtain Sync, Flash Exposure Compensation, Exposure Bracketing ( FEB ), FE Lock
-The flash Rang Setting
-High-speed Continuous Shooting
-Auto / Manual Zooming
-Ultra fast Charing Recycle System, supporting External Power Supply
 
Function
 
WITH TRANSMITTER – YN-622C / YN-622C-TX ETTL /M / Multi 
HSS to 1/8000th 
1st Curtain Sync / 2nd Curtain Sync 
FEC / FEB – 1/3rd Increments (±3 stops) 
Remote Flash Power – 1/128 – 1/1 (1/3rd increments) 
Remote Flash Zoom 20-200mm – Auto and Manual 
Group Control 

WITH TRANSMITTER – YN560 IV / YN560-TX 
Remote Flash Power – 1/128 – 1/1 (1/3rd increments) 
Remote Flash Zoom 20-200mm – Auto and Manual 
Group Control 

WITH TRANSMITTER – RF-605 
Fire the Flash 
Group Control 

WITH TRANSMITTER – RF-603 II / RF-603
Fire the Flash Only
 

 
Specification
High-speed Sync 
The max. sync speed is 1/8000s
Guide No.
60meters (ISO 100, 200mm)
Flash mode
ETTL ,M, MULTI
Trigger mode
set-top,wireless off-camera
Wireless triggering distance
20~25m indoor, 10~15m outdoor
Circuit design
 Insulated Gate Bipolar Transistor( IGBT)
Zoom range
AUTO, 20,24,28,35,50,70,80,105,135 200mm
Vertical rotation angle
70~90 degrees
Horizontal rotation angle
0~360 degrees
Power supply
4×AAsize batteries (Alkaline or Ni-MH are usable)
Lighting times
100~1500 times (AA alkaline cell used)
Recycle time
approx 3s (AA alkaline cell used)
Color temperature
5600k
Flash time
1/200s~1/20000s
Flash control
8 levels of output control (1/128~1/1), 29 levels of fine tuning
External interface
hot shoe, PC port and eternal power interface
External power
YONGNUO External Flash Pack like SF-18C, SF-17C
Wireless triggering distance
100m
Additional features
second-crutain sync, high speedlite sync, FEC, FEB, FEV, the electrontic flash head zooming,manual zoom, auto zoom, sound prompt, automatically saving setting, PC port, power saving mode and over heat protection
Dimensions
66×210×77mm (Extended state)
Net weight
426g

Compatible with

1) Hot shoe TTL mode:

Canon 1Dx, 1Ds series, 1D series, 5DIII, 5DII, 5D, 7D, 7DII 70D, 60D, 50D, 40D, 30D, 20D, 700D, 750D 650D/T4i, 600D/T3i, 550D/T2i, 500D/T1i, 450D/Xsi, 400D/Xti, 350D,100D, 1100D, 1000D, 1200D

2) Wirelss TTL Slave mode:

Canon 5DIII 7D 70D 60D 700D 650D 600D, Yongnuo ST-E2, Canon 580EX II

3) Wireless Manual ( RF-603 / RF-603 II mode ) System