Thanks for the reply. Maybe I can hopefully clarify my question. I'm concerned about the manufacturer's recommended lense to screen distance for my particular screen. I don't know what the requirements are for my particular setup. All movies will be seen with the height being the same, and the width being variable. I know that an overhead transparency projector will only focus an image on the screen to fill that screen also if you meet the minimum lense to screen distance. If I use a scaler to do the aspect ratio control for movies in the 2:35 format to fill the tube's raster area, then the full area of the tubes will be used with the use of that scaler, right? I want 2:35 movies to fill the screen, as the screen is in the 2:35 ratio, and the rest of movies in 4:3 & 16:9 to vary only to the width, and not the height. The projector's manual states the proper distance from projector lense to 4:3 screens, not 2:35 or 16:9. I need to know what the minimum distance for a 40" height screen is, and also conform for the variable width of other films not in the 2:35 aspect ratio as well
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