DB9S
Prominent Member
Don't forget the plane of the screen to the wall needs to be perfectly square to the plane of the lens too. If the bottom left corner is a little further away, or closer to, the lens then the other side. You will get exactly what you are seeing.Yeah, I know exactly what's not square, it's the screen, the corners aren't right angles so it makes a parallelogram instead of a rectangle. But I don't believe that's got anything to do with the focussing, as I said, I can take a bit of white card and move it all around the room and see how the focus changes in 3d space, and the right side is clear everywhere within 2m of the screen, at any angle, the left side is smeared within 2m of the screen.