BenQ TH671ST User Manual - Page 13

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. Projection dimensions 16:9 Screen diagonal H Screen Center of lens W Vertical offset Projection distance • The screen aspect ratio is 16:9 and the projected picture is in a 16:9 aspect ratio Screen size Diagonal Inch mm H (mm) 60 1524 747 70 1778 872 80 2032 996 90 2286 1121 100 2540 1245 110 2794 1370 120 3048 1494 140 3556 1743 160 4064 1992 180 4572 2241 W (mm) 1328 1550 1771 1992 2214 2435 2657 3099 3542 3985 Projection distance (mm) Min. distance (max. zoom) Average Max. distance (min. zoom) 917 1009 1102 1069 1178 1286 1222 1346 1470 1375 1514 1654 1528 1682 1837 1680 1851 2021 1833 2019 2205 2139 2355 2572 2444 2692 2940 2750 3028 3307 Offset lens position (mm) 19 22 25 28 31 34 37 44 50 56 For example, if you are using a 120-inch screen, the recommended projection distance is 2019 mm. • If your measured projection distance is 2300 mm, the closest match in the "Projection distance (mm)" column is 2355 mm. Looking across this row shows that a 140'' (about 3.6 m) screen is required. All measurements are approximate and may vary from the actual sizes. BenQ recommends that if you intend to permanently install the projector, you should physically test the projection size and distance using the actual projector in situ before you permanently install it, so as to make allowance for this projector's optical characteristics. This will help you determine the exact mounting position so that it best suits your installation location. Positioning your projector 13