Chapter 2 Getting Started — Setting up46 - ENGLISHFormula for calculating the projection distance per projection lensTo use a projected image size not listed in this manual, check the projected image size SD (m) and use therespective formula to calculate projection distance.The unit of all the formulae is m. (Values obtained by the following calculation formulae contain a slight error.)When calculating a projection distance using image size designation (value in inches), multiply the value in inchesby 0.0254 and substitute it into SD in the formula for calculating the projection distance.For PT-RZ31Kr Zoom LensProjection lens Model No. Throw ratio Aspect ratio Projection distance (L) formulaMin. (LW) Max. (LT)ET-D75LE60.9 - 1.1:1 16:10 = 0.8150 x SD - 0.0566 = 0.9764 x SD - 0.07360.9 - 1.1:1 16:9 = 0.8858 x SD - 0.0566 = 1.0630 x SD - 0.07361.1 - 1.3:1 4:3 = 0.7913 x SD - 0.0566 = 0.9488 x SD - 0.0736ET-D75LE101.3 - 1.7:1 16:10 = 1.1186 x SD - 0.0857 = 1.4458 x SD - 0.10851.3 - 1.7:1 16:9 = 1.1497 x SD - 0.0857 = 1.4860 x SD - 0.10851.6 - 2.0:1 4:3 = 1.2663 x SD - 0.0857 = 1.6367 x SD - 0.1085ET-D75LE201.7 - 2.4:1 16:10 = 1.4312 x SD - 0.0832 = 2.0795 x SD - 0.11621.7 - 2.4:1 16:9 = 1.4709 x SD - 0.0832 = 2.1373 x SD - 0.11622.0 - 2.9:1 4:3 = 1.6202 x SD - 0.0832 = 2.3542 x SD - 0.1162ET-D75LE302.4 - 4.7:1 16:10 = 2.0647 x SD - 0.1131 = 4.0041 x SD - 0.17652.4 - 4.7:1 16:9 = 2.1221 x SD - 0.1131 = 4.1155 x SD - 0.17652.9 - 5.6:1 4:3 = 2.3374 x SD - 0.1131 = 4.5330 x SD - 0.1765ET-D75LE404.6 - 7.4:1 16:10 = 3.9532 x SD - 0.1577 = 6.3027 x SD - 0.16154.6 - 7.4:1 16:9 = 4.0631 x SD - 0.1577 = 6.4779 x SD - 0.16155.5 - 8.9:1 4:3 = 4.4754 x SD - 0.1577 = 7.1351 x SD - 0.1615ET-D75LE87.3 - 13.8:1 16:10 = 6.4567 x SD - 0.3862 = 12.0945 x SD - 0.35987.3 - 13.8:1 16:9 = 7.0315 x SD - 0.3862 = 13.1732 x SD - 0.35988.8 - 16.5:1 4:3 = 6.2795 x SD - 0.3862 = 11.7677 x SD - 0.3598r Fixed-focus LensProjection lens Model No. Throw ratio Aspect ratio Projection distance(L1) formulaFormula for distance between projector andscreen (A1)Min. Max.ET-D75LE950.36:1 16:10 = 0.303 x SD + 0.020 = 0.184 x SH - 0.128 = 0.283 x SH - 0.1280.36:1 16:9 = 0.312 x SD + 0.020 = 0.205 x SH - 0.128 = 0.370 x SH - 0.1280.44:1 4:3 = 0.343 x SD + 0.020 = 0.184 x SH - 0.128 = 0.283 x SH - 0.128Projection lens Model No. Throw ratio Aspect ratio Projection distance (L) formulaET-D75LE500.7:1 16:10 = 0.6072 x SD - 0.07130.7:1 16:9 = 0.6240 x SD - 0.07130.8:1 4:3 = 0.6873 x SD - 0.0713
