However, the entire catch: Modern cameras use pre-flashes (Meßblitze and red-eye reduction flashes) - and already the first pre-flash triggers the adapter and thus the connected slave flash off.
The slave flash usually has a far too long reload time, in order to then be triggered again with the immediately subsequent main flash of the camera, the exposed recording can.
The device is very useful, but only within its scope. A "universal weapon" against the high cost of dedicated flash units of modern cameras it is not.
