Well, I had ordered some YongNuo triggers today, and judging by the reviews I had very high hopes for them. After the batteries were put in, they lit up, and the LEDs were functioning perfectly on the wakeup function, as well as turning the correct color when the shutter fires. All seems good. EXCEPT they don't fire the flash! They're obviously getting the radio signal and working correctly, only the don't fire my Vivitar 275 or my Minolta 2800AF. The hotshoe is clearly designed for Nikon flash, so do these only fire TTL flashes? In that case, shouldn't the Minolta fire? Help!