Basically, the rule of thu

Basically, the rule of thumb is (video_Import_settings)=Project_settings=Output(refined); If it’s HD widescreen, and you get a black border top and botom, well, oh well, thats HD.. don’t worry about it. Any “tweaking” and you asking for trouble. Distorted images, etc. Unless you ARE wanting that effect.

here is an example, were it is distorted ON PURPOSE, shot in high def. It’s a music vid http://au.youtube.com/watch?v=IOrV9SYR-qk