Brett, if the projected picture were to be viewed through a translucent screen, like a rear-projection TV, the upside-down position would be right. The Fresnel lens reverses the horizontal and vertical orientation of the image.

However, when used in the more-typical front-projection mode, the horizontal scan would, because of the lens, produce the picture reversed. This is the reason that the leads to the deflection coils that control 'raster' have to be reversed.

Larry
www.fineelectricco.com