The remote control works for me without problems. I can therefore also trigger from behind by side as long as I am in the vicinity of the camera. From the front, I tested a distance of 5m successfully. Of course, the camera must first to remote control (with the A57: left control switch button to "Drive Mode", then all the way down or one up) can be switched and the plastic part between battery and contact to be removed. This part I put clean afterwards again in order to avoid a possible self-discharge by a pressure in the pocket.
