Ortho width = 800 How do I make it pixel perfect?

I know if you set the ortho width to match your screen res then you get pixel perfect results, but that would give players with larger screens an poor viewing experience. I have my camera set to ortho width 800 Which is perfect for my game. But the pixels are all stretched. I have my pixel to unreal units at 1.0 so there shouldn’t be a problem there. Any help?

You just get the viewport size break into a vector take the X and divide by 2 = orthowidth