Ok....I just got off of the phone with Sony tech support. I bought an HVL F43AM flash because it said that it was wireless compatible with the RX1.Advertisement Well...long story short the WAY it's compatible is that it will trigger OTHER ADDITIONAL Sony compatible as long as it's connected to the hot shoe. Not what I wanted at all. I thought that it was like the Nikon commander mode....it's not. It appears that external flashing is limited to a few different ways: 1.) Multi-function-to-normal hotshoe adapter> wireless manual trigger // wireless receiver on flash. 2.) External compatible flash that will trigger other flashes from the hotshoe 3.) The Pop up flash triggering other flashes via optical slave mode. The issues I see are that I don't want to take my EVF off all of the time to put a trigger on unless I HAVE to for some special reason. The only option that seems remotely acceptable to me is the pop up flash mode. Oh well...live and learn...anyone wanna buy an HVL F43AM?