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Formula to calculate projection distance per projection lens
To use a screen size not listed in this manual, check the screen size SD (m) and use the respective formula to calculate projection distance.
The unit of all the formulae is m. (Values obtained by the following calculation formulae contain a slight error.)
For PT-DZ870E
Lens type
Standard zoom lens
Fixed-focus lens
Ultra short focus zoom lens
Short focus zoom lens
Intermediate focus zoom lens
Long focus zoom lens
Ultra long focus zoom lens
44 - ENGLISH
Chapter 2 Getting Started — Setting up
Projection lens Model
Aspect ratio
No.
16:10
—
16:10
ET-DLE055
16:10
ET-DLE085
16:10
ET-DLE150
16:10
ET-DLE250
16:10
ET-DLE350
16:10
ET-DLE450
Projection distance (L) formula
Min. (LW)
L = 1.4906 x SD - 0.0746
Max. (LT)
L = 2.0814 x SD - 0.0725
Min. (LW)
L = 1.5320 x SD - 0.0746
16:9
Max. (LT)
L = 2.1393 x SD - 0.0725
Min. (LW)
L = 1.6874 x SD - 0.0746
4:3
Max. (LT)
L = 2.3563 x SD - 0.0725
—
L = 0.6893 x SD - 0.0476
16:9
—
L = 0.7084 x SD - 0.0476
4:3
—
L = 0.7803 x SD - 0.0476
Min. (LW)
L = 0.6865 x SD - 0.0471
Max. (LT)
L = 0.8498 x SD - 0.0442
Min. (LW)
L = 0.7056 x SD - 0.0471
16:9
Max. (LT)
L = 0.8735 x SD - 0.0442
Min. (LW)
L = 0.7772 x SD - 0.0471
4:3
Max. (LT)
L = 0.9621 x SD - 0.0442
Min. (LW)
L = 1.1259 x SD - 0.0540
Max. (LT)
L = 1.6243 x SD - 0.0498
Min. (LW)
L = 1.1572 x SD - 0.0540
16:9
Max. (LT)
L = 1.6695 x SD - 0.0498
Min. (LW)
L = 1.2747 x SD - 0.0540
4:3
Max. (LT)
L = 1.8388 x SD - 0.0498
Min. (LW)
L = 1.9665 x SD - 0.0800
Max. (LT)
L = 3.1059 x SD - 0.0792
Min. (LW)
L = 2.0212 x SD - 0.0800
16:9
Max. (LT)
L = 3.1923 x SD - 0.0792
Min. (LW)
L = 2.2263 x SD - 0.0800
4:3
Max. (LT)
L = 3.5161 x SD - 0.0792
Min. (LW)
L = 3.1000 x SD - 0.1351
Max. (LT)
L = 4.6843 x SD - 0.1346
Min. (LW)
L = 3.1862 x SD - 0.1351
16:9
Max. (LT)
L = 4.8146 x SD - 0.1346
Min. (LW)
L = 3.5094 x SD - 0.1351
4:3
Max. (LT)
L = 5.3030 x SD - 0.1346
Min. (LW)
L = 4.6931 x SD - 0.3017
Max. (LT)
L = 7.4193 x SD - 0.2991
Min. (LW)
L = 4.8236 x SD - 0.3017
16:9
Max. (LT)
L = 7.6256 x SD - 0.2991
Min. (LW)
L = 5.3129 x SD - 0.3017
4:3
Max. (LT)
L = 8.3992 x SD - 0.2991
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