HVL-F60M with RX1
I suspect the RX1 is like the RX100 (and Nex7), the pop up will not trigger shoe mounted Sony or Minolta flashes. You can use other flashes (like F42, 43, 58AM) with adapter to trigger the 60M or vice versa. If you don't need 3 groups and ratio the cheapest is probably the F20AM +adapter as trigger. It works for my A99 at least.