Review on Wireless Flash Speedlite with Radio Slave for Canon - YONGNUO YN685 - GN60 2.4G System with ETTL and HSS Capabilities by Mark Raj

Amazing. I do NOT understand the comments about the "limited functionality" radio. Everything works. I use this with a YN-622C-TX on my Canon 6D and can control everything from the camera. Tried normal flash, second-curtain sync, multi, e-ttl-II with auto tracking, high-speed sync, etc. Everything works. I see no need for an external radio. HSS offers a shutter speed of 1/4000 (at 6D) and is perfect for indoor stop motion shots like kids who never stop moving. With normal flash, there's a lot of ambient light coming in because the shutter has to be slowed down to less than 1/250 to sync with the flash (depending on your camera), and that light blurs the photo when your subject is moving fast. You end up with a sharp flash photo with a blurry ghost. Very ugly and disappointing so far! For less than the cost of a Canon Speedlite I got 3 of these plus the transmitter. He also looks well built. It took a bit of trial and error to get it working, but it was MUCH less painful than I thought it would be. I'm not a flash expert. The manuals aren't the best but I'm sending back the individual transceivers I bought and using the radio in the Blitz, again with full E-TTL, second curtain sync, multi, HSS etc with a cheap YN- 622C-TX on my 6D. I've wanted an HSS for a long time and for the price you can't get any better.