BenQ W5000 User Manual - Page 12

English W20000-en.book Page 12 Monday, October 22, 2007 3:35 PM 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. This projector is equipped with a movable lens. See "Shifting the projection lens vertically" below for details. You can see the diagrams on pages 14 and 15 for the vertical offset values in the dimension tables that are measured when the lens is shifted fully up or down. 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 separate tables of dimensions for both 16:9 and 4:3 screen ratios 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). Shifting the projection lens vertically The vertical lens shift control provides flexibility for installing your projector. It allows the projector to be positioned slightly above or below the top level of the projected images. The lens shift (offset) is expressed as a percentage of the projected image height. It is measured as an offset from the projected image's vertical center. The projector is equipped with + 120% and - 80% vertical lens shift. You can shift the projection lens upwards or downwards within the allowable range depending on your desired image position. To adjust the vertical position of the projection lens: 1. Press LENS or / (when the OSD menu is not activated) on the remote control, or LENS SHIFT / on the projector to display the adjustment page. (Pressing ENTER in the Picture -- Advanced > Lens Shift menu performs the same function.) 2. To raise the projected image, press on the remote control or Lens Shift on the projector. To lower the projected image, press on the remote control or Lens Shift on the projector. Picture -- Advanced Black Level Clarity Control Color Temperature Color Temperature User_ Fine Gamma Selection Brilliant Color Color Management Dynamic Black IRIS 0 Lens Shift S-Video Lens Shift 0 IRE Normal 2.4 On On ENTER EXIT Back Projector position: Floor front or floor rear Projector position: Ceiling front or ceiling rear (D) (C) (C) (D) Center of the lens Center of the lens EXIT Back See pages 14 and 15 for the corresponding values of (C) and (D). 12 Positioning your projector