YN685 Description :

With a built-in YN-622N radio transceiver, the YN685 Wireless TTL Speedlite from Yongnuo offers complete radio slave functionality with both the YN-622N and RF-603/YN-560 radio systems for maximum compatibility with your existing gear. The flash is also compatible with Canon's E-TTL / E-TTL II flash system when mounted to the camera and has a powerful guide number of 197' at ISO 100 and 200mm.

Benefiting this power is a wide zoom range which will cover 20-200mm in full frame and it has a diffuser for wide angle lenses. Full bounce and tilt is available as well with tilt upwards up to 90° and rotation left and right of 180°. Operation is simplified with a clear LCD screen on the back, a dial, and a selection of buttons. The head also offers a pull-out bounce panel for reflecting some light forward when using the tilt functionality. Full sync options are available as well with high-speed, 1st & 2nd curtain sync. It conveniently on 4 AA batteries and has a recycle time of 3 seconds at full power and has an HV power port for battery packs. Additionally, it has a PC sync port and USB port for firmware updates.

High-speed sync to 1/8000 second
Flash exposure compensation and bracketing in 1/3 EV increments from -3 to +3 EV
Manual power output from 1/128 to 1/1
Heat protection
Sound prompts
Custom functions and auto save settings
Locking metal foot

YN622-TX Flash Controller Description :

Control multiple flashes equipped with the YN-622N i-TTL transceiver with the YN-622N-TX i-TTL Wireless Flash Controller from Yongnuo. Compatible with Nikon i-TTL cameras, this controller slides directly into the hot shoe and utilizes a 2.4 GHz frequency with a range of 328' to trigger the remote flashes. The controller also has TTL, manual, and multi flash modes available for full creative control. Additionally, it can utilize 7 channels and 3 groups for setting up multiple flash units easily and efficiently.

The YN-622N-TX utilizes an LCD screen to display settings and allow users to make adjustments. On the device is also an AF assist beam to help in low-light conditions. Multiple sync modes are available for more specific needs or effects, including 1st and 2nd curtain sync. A high speed sync mode will help in bright lighting conditions and for stopping motion with a maximum speed of 1/8000 second. A built-in mini-USB port enables firmware updates to be installed, and the device runs on 2 AA batteries.