DLV1280-DX User Manual - Christie Digital Systems

Appendix EThrow DistanceAlways consult this Appendix when planning a projector installation. See also 2.3, Projector Position and Mounting.Calculating Throw DistanceCorrect throw distance depends on the screen size and lens present—the larger the imageneeded, the greater the distance you must allow between the lens and screen. Once youknow the screen size and lens type present, you can calculate the precise throw distance yourequire by using theappropriate formula asfound in this appendix.Throw distance is thedistance between theprojector front feet and thescreen. This measurementis not necessarily parallel tothe floor—i.e., the projectorand screen may be inclined.NOTE: If your projectoris tilted up or down inrelation to the screen, asis sometimes the case for large venues or elevated installations, throw distance stillrepresents the smallest measurement between the screen and front feet center axes.Pre-calculated throw distances for the standard lens and screen sizes appear on thefollowing page. Refer to this chart to quickly determine the proper throw distance(±5%) for your installation and this lens. NOTE: Other compatible lenses are listedon page 5-1, however their throw distance formulas are not included in this manual.Table E-1. Throw Distance FormulaLens Throw Ratio Throw Distance Formula (in.) ±5% Diagonal Screen Size ➹ (in.)1.2:1 (standard) 1.24 x screen width (↔ in.) + 9.84 60-360”NOTE: Make sure to use HORIZONTAL screen size in this formula.DLV1280 DX User’s Manual E-1