Epson 811 image is filling up only 50%
(The presenter image was at 100%.
The computer is set at 800 X 600.)
You need to ensure that the projector is also set to the same resolution. This is found in the Menus. Enter the Video Menu, step down to “Resolution”, switch to Manual, set the unit to the proper resolution, then press select. Be careful at this point, there is a MAC resolution setting that reads the same but gives you the problem you are having. The mode you need is further up the scale.