BenQ MP782ST User Manual - Page 15
Obtaining a preferred projected image size
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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. The projector should always be placed horizontally level (like flat on a table), and positioned directly perpendicular (90° right-angle square) to the horizontal center of the screen. This prevents image distortion caused by angled projections (or projecting onto angled surfaces). If the projector is mounted on a ceiling, it must be mounted upside-down so that it projects at a slightly downward angle. You can see from the diagrams on page 17, that this type of projection causes the bottom edge of the projected image to be vertically offset from the horizontal plane of the projector. When ceiling mounted, this refers to the top edge of the projected image. If the projector is positioned further away from the screen, the projected image size increases, and the vertical offset also increases proportionately. When determining the position of the screen and projector, you will need to account for both the projected image size and the vertical offset dimension, which are directly proportional to the projection distance. BenQ has provided tables of 16:9-aspect-ratio and 4:3-aspect-ratio screen sizes to assist you in determining the ideal location for your projector. There are two dimensions to consider, the perpendicular horizontal distance from the center of the screen (projection distance), and the vertical offset height of the projector from the horizontal edge of the screen (offset). How to determine the position of the projector for a given screen size 1. Determine the aspect ratio of your screen, 16:9 or 4:3? If you have a 16:9 screen, refer to page 17. If you have a 4:3 screen, refer to page 18 depending on the projected picture aspect ratio you've got. 2. Select your screen size. 3. Refer to the table on page 17 and find the closest match to your screen size in the left columns labelled "(a) Screen size". Using this value, look across this row to the right to find the corresponding average distance from screen value in the column labelled "(b) Distance from screen". This is the projection distance. 4. On that same row, look across to the right column and make note of the "(c) Vertical offset" value. This will determine the final vertical offset placement of the projector in relation to the edge of the screen. 5. The recommended position for the projector is aligned perpendicular to the horizontal center of the screen, at the distance from the screen determined in step 3 above, and offset by the value determined in step 4 above. For example, if you are using an 120-inch, 4:3-aspect-ratio screen and the projected picture is 16:10, please refer to Table B2 on page 18, the recommended projection distance is 1192 mm and the vertical offset is 76 mm. How to determine the recommended screen size for a given distance This method can be used for situations where you have purchased this projector and would like to know what screen size will fit in your room. The maximum screen size is limited by the physical space available in your room. Positioning your projector 15