Acer X1185 User Manual - Page 28
Remind as below the space of 424 cm height is, sizes around 242.
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English 18 • XGA (fixed-zoom models) If the projector is 3 m from the screen, good image quality is possible for image sizes around 242". Note: Remind as below figure, the space of 424 cm height is required when located at 3 m distance. 242" 3 m Desired distance Screen Size Desired Distance (m) < A > Diagonal (inch) < B > From base to W (cm) x H (cm) top of image (cm) < C > 1 81 164 x 123 141 1.5 121 246 x 184 212 2 161 328 x 246 283 2.5 202 410 x 307 353 3 242 492 x 369 424 3.5 282 574 x 430 495 4 323 656 x 492 566 4.5 363 738 x 553 636 5 403 820 x 615 707 6 484 984 x 738 848 7 565 1148 x 861 990 8 645 1311 x 984 1131 9 726 1475 x 1107 1273 10 807 1639 x 1230 1414 11 887 1803 x 1352 1555 12 968 1967 x 1475 1697 Zoom Ratio: 1.0 x Height: 424 cm From base to top of image