Obtaining a preferred projected image size
The distance from the projector lens to the screen, the zoom setting, and the video format each factors in the projected image size. BenQ has provided separate tables of dimensions for both 16:9 and 4:3 screen ratios to assist you in determining the ideal location for your projector.
1.Determine the aspect ratio of your screen (4:3 or 16:9).
2.Determine the projection distance allowed in your room. Install the projector at a proper distance from the screen.
3.Refer to the table of 4:3 or 16:9 Screen Size depending on your screen ratio. Locate the suitable value in the column of “Distance from Screen”. In the same row, you will find the maximum and minimum projected image sizes.
4.Determine the preferred height of your projector.
For example, if you are using a 4:3 screen with 2.5 meters projection distance, the maximum image size is close to 1.91 meters diagonal.
If you place the projector above or below the screen, you have to tilt it down or up to center the image on the screen after turning the projector on. In these situations, some image distortion will occur. Use the Keystone function to correct the distortion. See page 19 for keystone correction.
Maximum zoom
Minimum zoom
Focus ring 
Zoom ring 
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12 Positioning your projector