That's why, with an 800x600 projector, we recommend a compromise in picture size. Set the 1.16X zoom lens to its smallest picture size. This compresses the pixels, so it's less likely to have a "screen door" effect. Also, view the image from a distance of at least two to three times the image's height. We set the MS4 up 8 feet from our screen, for an image size 4 feet wide, and it looked great from our seat about 9 feet away.