This is my very first day of shooting with flash and remote flash. And picture turned out like this: Bottom half of it is black. I have no idea what has caused this and how to prevent it? I just know that after this I shot a few more frames without flash or only with the camera's built-in flash and they were fine so I know the camera is not broken. When I read the photo EXIF info this is what I had: 1/400 sec with f 2.8 and 60mm. My flash is a manual flash and its power was on 1/32 and zoom on 70mm.
No specific reason for these numbers, I was only experimenting. Also I had set the exposure compensation of the camera to -5.00 in the hope that it would make the background darker and the foreground look more 3D because of the flash.
Answer
You're shooting with a shutter speed faster than your sync speed (most likely 1/200 or 1/250). Your camera's shutter consists of two curtains -- the first one opens to begin the exposure, and the second follows it -- closing to end the exposure. At speeds slower than your camera's sync speed, these two curtain movements allow at least a tiny fraction of time between opening and closing, but at faster shutter speeds, the closing curtain is actually chasing the opening curtain, creating a moving slit of exposure. A flash occurring during such an exposure is only going to illuminate part of the sensor - hence, the dark bar.
This is a bit tricky to picture, but this video shows exactly what's happening with those curtains:
https://www.youtube.com/watch?v=CmjeCchGRQo
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