I have a 16:9 format screen and every time I watch a movie, I wish I had something to mask off the top and the bottom of the screen, but I haven't come up with a low cost, yet nice looking, way to do it. If I had a 2.35:1 screen, then the issue would be bars on the right and left side instead of the top and bottom like on my 16:9 screen. Those would be easier to just hang some sort of mask on each side (thanks to gravity) and adjust them as needed. SkyHawk is right on the mark. That is what movie theaters do.
For my 16:9 screen, I will have to find something rigid, yet light, to put over the top and bottom bars. Not that easy over a 8' span.
