Review on Yongnuo YN 622N TX I TTL Wireless Controller by Dale Toth

I have a Nikon SB910 and three Yongnuo 568 EX II flashes which I have optically triggered using a 910 flash for reference. I wanted to go wireless for more reliability, especially when shooting outdoors during the day. I bought a YN-622N-TX i-TTL controller and four YN-622N transceivers as it seemed like the best option given my equipment. The manuals are somewhat cryptic and written in non-standard English. (Yonguo, I'm a good technical writer and I'm happy to offer my services). However, figuring out how to set up the system wasn't that difficult. Triggers offer three groups (A, B and C) and seven different channels. Each group can be set up independently to work in i-TTL, manual and super sync modes with flash output control in each mode. I haven't figured out how the Super Sync system works yet, but I've only had it for a few days. And the controller can be used to set the flash zoom levels either automatically based on the focal length of the lens or to a specific value. So far the system works well enough for me. I had an issue with flashes not firing until I realized that flashes on transceivers shouldn't be in slave mode. They should be positioned as if they were on the camera. The only real issue I've encountered so far is that the flash output isn't the same as if the flashes were on-camera mounted or triggered. optical. This is especially noticeable when used in i-TTL mode. Flash output is slightly dimmer than optical trigger. The result is also different in manual mode. This isn't hard to compensate for by adjusting the flash power, but it looks like a flash set to 1/32 with the 622 controller and transceiver should have the same power as the same flash set to that setting the camera is set. With the i-TTL setting, the pre-flash appears very bright. I hardly notice the pre-flash when the flash is on the camera or optically triggered. So I'm wondering if a strong pre-flash doesn't give enough time for the flash to fully charge before the actual flash fires, resulting in lower flash output. I think I can work with the system while checking and adjusting flash power levels, but Yongnuo needs to fix this difference in flash power. And yes, I updated the firmware in the controller to the latest version as soon as I received it.