Chapter 2
Getting Started — Setting up
44 - ENGLISH
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
Projection lens Model
No.
Aspect ratio
Projection distance (L) formula
Standard zoom lens
—
16:10
Min. (LW)
L = 1.4906 x SD - 0.0746
Max. (LT)
L = 2.0814 x SD - 0.0725
16:9
Min. (LW)
L = 1.5320 x SD - 0.0746
Max. (LT)
L = 2.1393 x SD - 0.0725
4:3
Min. (LW)
L = 1.6874 x SD - 0.0746
Max. (LT)
L = 2.3563 x SD - 0.0725
Fixed-focus lens
ET-DLE055
16:10
—
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
Ultra short focus zoom lens
ET-DLE085
16:10
Min. (LW)
L = 0.6865 x SD - 0.0471
Max. (LT)
L = 0.8498 x SD - 0.0442
16:9
Min. (LW)
L = 0.7056 x SD - 0.0471
Max. (LT)
L = 0.8735 x SD - 0.0442
4:3
Min. (LW)
L = 0.7772 x SD - 0.0471
Max. (LT)
L = 0.9621 x SD - 0.0442
Short focus zoom lens
ET-DLE150
16:10
Min. (LW)
L = 1.1259 x SD - 0.0540
Max. (LT)
L = 1.6243 x SD - 0.0498
16:9
Min. (LW)
L = 1.1572 x SD - 0.0540
Max. (LT)
L = 1.6695 x SD - 0.0498
4:3
Min. (LW)
L = 1.2747 x SD - 0.0540
Max. (LT)
L = 1.8388 x SD - 0.0498
Intermediate focus zoom lens
ET-DLE250
16:10
Min. (LW)
L = 1.9665 x SD - 0.0800
Max. (LT)
L = 3.1059 x SD - 0.0792
16:9
Min. (LW)
L = 2.0212 x SD - 0.0800
Max. (LT)
L = 3.1923 x SD - 0.0792
4:3
Min. (LW)
L = 2.2263 x SD - 0.0800
Max. (LT)
L = 3.5161 x SD - 0.0792
Long focus zoom lens
ET-DLE350
16:10
Min. (LW)
L = 3.1000 x SD - 0.1351
Max. (LT)
L = 4.6843 x SD - 0.1346
16:9
Min. (LW)
L = 3.1862 x SD - 0.1351
Max. (LT)
L = 4.8146 x SD - 0.1346
4:3
Min. (LW)
L = 3.5094 x SD - 0.1351
Max. (LT)
L = 5.3030 x SD - 0.1346
Ultra long focus zoom lens
ET-DLE450
16:10
Min. (LW)
L = 4.6931 x SD - 0.3017
Max. (LT)
L = 7.4193 x SD - 0.2991
16:9
Min. (LW)
L = 4.8236 x SD - 0.3017
Max. (LT)
L = 7.6256 x SD - 0.2991
4:3
Min. (LW)
L = 5.3129 x SD - 0.3017
Max. (LT)
L = 8.3992 x SD - 0.2991
