Hi, I've been filming wildlife with an Olympus Pen E-PL1 (connected to a Sigma 500mm lens via an adapter), and getting quite good sound with the Olympus ME51S external microphone. However, I want more directional sound, so tried two shotgun mics - a Hama RMZ-10, and a Sony ECM-CG50. Both gave extremely low volume sound, to the point of being almost inaudible. I tried using a pre-amp, and turning up the gain, which helped a bit, but not enough. Anyone used a shotgun mic successfully with my camera (or similar), and which one was it? (I'm a total novice at this as you can no doubt tell.) Thanks.