I have an 78 inch wide owl electrical screen that I can stop at any length. I set up my pj last night so that true 16 x9 fills up whole screen when i make screen length 43.4 inches. (16 x9). I initially thought all i needed to do to accomode 2.35:1 , 4/3 etc was adjust the screen length but this would only be the case if picture was projected to top of screen downwards for each ratio. What do most folk do to accomodate all these non 16/9 ratios.