I have radio triggers too for those outside circumstances or where line of site is not happening. But my first preference is the ST-E2. I rarely use it in E-TTL (mostly manual) but it is a great feature to have when time is paramount. I think learning the E-TTL is advantageous too, a lot of the time you will hear photographers talk about ratios for multi-light situations. Power settings will change with f/stops and different ambient situations but desired ratios usually stay the same.


I mostly suggested the ST-E2 due to the fact it will work seamlessly with your existing flash without hot shoe add ons since it doesn't have a pc jack. Plus adding Canon flashes in the future wouldn't require additional purchases of triggers or hot shoe add ons.