Screens Suited for the WT Series The unit can accommdate screen sizes from 40" (81.3 cm/32.0" W x 61.0 cm/24.0" H) to 100" (203.2 cm/80.0" W x 152.4 cm/60.0" H). Use a panel or tension type screen that has a flat surface. Do not use roll type screens and other screens that bend or form a wavy surface easily. Doing so will result in increased distortion of the projected image. View the screen directly from the side so that it is perfectly vertical. A slanted screen will result in increased keystone distortion. In using this unit, increasing the screen size will move the projection position upward. To accommodate this, please use a screen that has higher and lower positioning adjustment. See "Screen Distance" for information about the positioning relationships between the screen and this unit. High gain type screens are not optimal for use with this unit. The lower the screen gain (i.e., screen gain on the order of 1), the better the appearance of the projected image. For more information about screen gain, consult catalogs from screen makers. Screen frames or pen shelves that protrude from the front of the screen surface may block some of the light from the projector. Due to the projection angle of the unit, many standard rear projection screens may produce uneven brightness, hot spotting or not produce maximum brightness to the viewer. For more details utilizing rear projection screens and their applications with this projector, please contact your NEC dealer. Controlled ambient light environments will allow for an image of higher contrast and depth to be displayed. Screens with a soiled, scratched, or discolored area will not produce a clean image. Care should be used in the handling of the screen.   Stands Suited for the WT Series In using this unit, increasing the screen size will move the projection position upward. To accommodate this, please use a stand that has a height positioning adjustment. See "Screen Distance" for information about the positioning relationships between the screen and this unit. Use a stand that will allow this unit to be set up in a level condition. Turn the foot of this unit and adjust so that the unit is level.   Ambient environmental condition Do not place the screen near vents. Air blow hits the screen, causing the projected image to ripple.   Do not illuminate the projector with strong light source such as halogen lamp. Doing so can cause the object detection sensor to malfunction, resulting in the projector not turning on.