Sony A77 Yongnuo RF 603 (conversion to Sony) ... with the original Yong. Adapter is not running; Offset of the rear contact! With this, it works perfectly. With the appropriate cable, you can even focusing and flash on the remote trigger. For this I have the Yong 560 III in use. Unbeatable in terms of price performance. And if you have a little bit of dealing with the issue, it also works very well without TTL.