Still unclear what your goal is. If your goal is to watch 2.35:1 aspect ratio movies on a 16x9 screen, yes you can do that. I used to have a 110" 16x9 screen and would put up masking on the screen when I watched 2.35:1 movies to block out the "black bars". Since I found myself primarily watching 2.35:1 content, I switched to a 115" 2.35:1 screen, which is several inches wider than the 16x9 screen was and also several inches shorter. Now, if I want to watch 16x9 content on my screen, the effective size is about 92".
Or build one. Go to display devices, screens and at the top there is a sub menu for DIY screens.
I have a 100” 16x9 screen I am considering replacing with a 120” 2:40. In this case I lose around 3” of height when 16x9 is displayed on that 2:40 screen, but I gain a gloriously wide screen when viewing 2:40. Hope this helps
Gain matters, it's one of several important factors in determining how bright your image is. With proper HDR (4k) requiring more light than SDR a high gain screen can be helpful, but it also depends on how big of an image you are throwing, the light output of your projector, your throw distance, and how wow well your room is treated for reflections.
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