The TTL function does not work with my Canon 6D because it does not recognize automatic mode to connect the flash and the camera. In manual mode, the images are ok. If done adjustments of B / W, ISO, etc. But unfortunately, the main purpose of the purchase was to be used on TTL to simplify the use of it I recommend spending a little more money and get the flash "Ongnuo YN568EX II flash / speedlite". This is a very good flash and as good as the Canon Thank you