Benq TH670s User Manual download pdf (Page 17)

Positioning your projector 17

Obtaining a preferred projected image size

The distance from the projector lens to the screen, the zoom setting (if available), 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 diagram on page 18, 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

proportional to the projection distance.

BenQ has provided a table of 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).

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Benq TH670s User Manual Page 17