Epson PowerLite 800F 5000-Lumen Pixel-Shift Full HD Ultra-Short Throw Laser 3LCD Projector (White) - Manual (Page 30)

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Projection Distance
The distance at which you place the projector from the screen determines the approximate size of the
image. The image size increases the farther the projector is from the screen, but can vary depending on
the zoom factor, aspect ratio, and other settings.
Use the tables here to determine approximately how far to place the projector from the screen based on
the size of the projected image. (Conversion figures may have been rounded up or down.)
You can also use the Projection Distance Calculator here (U.S.), here (Canada), or here (Caribbean).
1 Projection distance
2 Distance from the top of the projector to the top of the image (when projecting from a wall or table
mount) or base of the image (when projecting from a flat surface)