With this hotshoe socket, you'll be able to use Sony or Minolta Flash on other cameras (e.g. Nikon Canon Olympus etc).
This converter has a build in PC sync cord socket
On some flash like F42, it needs to be sync with the camera body first before it can be triggered. Hence, mount the F42 onto the Sony camera, half press the shutter button, take out the F42 without turning it off, mount it to the flash trigger/other camera