In case any of you hadn't heard, there's a new, free, PlayMemories app that allows anyone with a newish Sony camera (that has a viewfinder) to activate the shutter by just waving your hand across the viewfinder. It works great, and makes it easy to take shots where you don't want to physically touch the shutter and cause vibration. On the A7S and A7ii (but not on any other Sony camera) you can even use the Bulb mode by waving your hand once to open and another time to close the shutter. I've been playing with it, and you only need to get your hand within about 3 cm to activate it. It's now in beta, and I have no idea if Sony will start charging for it once it's ready for release.