Recently got my KD48A9 TV.  I like films but everyone I select is in letterbox.  In Sky I have tried changing the screen to zoom to avoid the risk of burn in, but the picture is not as good.  On Netflix I don’t seem to have an option to do this.  On the burn-in issue, Sony recommends avoiding letterbox format.  I watch a film about a couple of times per week.  If I am watching in letterbox format is it just a matter of time before I get burn in?  Your thoughts and advice would be much appreciated.