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Standard installation dimensions (continued)
■
Projection distance according to the projector lens.
For the projection distances for projection lenses (optional), refer to the operating instructions [Installation]
provided with the projector. Or check the diagonal dimension (m) of your projected image and calculate the
projection distance using the following formula.
z
In the case of PT-DZ870
Unit: m
Lens type
Model number of
projection lens
Aspect
ratio
Projection distance (L) formula
Standard zoom lens
—
16 : 10
Minimum(LW)
L = 1.4906 x SD(m) - 0.0746
Maximum(LT)
L = 2.0814 x SD(m) - 0.0725
16 : 9
Minimum(LW)
L = 1.5320 x SD(m) - 0.0746
Maximum(LT)
L = 2.1393 x SD(m) - 0.0725
4 : 3
Minimum(LW)
L = 1.6874 x SD(m) - 0.0746
Maximum(LT)
L = 2.3563 x SD(m) - 0.0725
Fixed-focus lens
ET-DLE055
16 : 10
—
L = 0.6893 x SD(m) - 0.0476
16 : 9
—
L = 0.7084 x SD(m) - 0.0476
4 : 3
—
L = 0.7803 x SD(m) - 0.0476
Ultra short focus zoom lens
ET-DLE085
16 : 10
Minimum(LW)
L = 0.6865 x SD(m) - 0.0471
Maximum(LT)
L = 0.8498 x SD(m) - 0.0442
16 : 9
Minimum(LW)
L = 0.7056 x SD(m) - 0.0471
Maximum(LT)
L = 0.8735 x SD(m) - 0.0442
4 : 3
Minimum(LW)
L = 0.7772 x SD(m) - 0.0471
Maximum(LT)
L = 0.9621 x SD(m) - 0.0442
Short focus zoom lens
ET-DLE150
16 : 10
Minimum(LW)
L = 1.1259 x SD(m) - 0.0540
Maximum(LT)
L = 1.6243 x SD(m) - 0.0498
16 : 9
Minimum(LW)
L = 1.1572 x SD(m) - 0.0540
Maximum(LT)
L = 1.6695 x SD(m) - 0.0498
4 : 3
Minimum(LW)
L = 1.2747 x SD(m) - 0.0540
Maximum(LT)
L = 1.8388 x SD(m) - 0.0498
Intermediate focus zoom lens
ET-DLE250
16 : 10
Minimum(LW)
L = 1.9665 x SD(m) - 0.0800
Maximum(LT)
L = 3.1059 x SD(m) - 0.0792
16 : 9
Minimum(LW)
L = 2.0212 x SD(m) - 0.0800
Maximum(LT)
L = 3.1923 x SD(m) - 0.0792
4 : 3
Minimum(LW)
L = 2.2263 x SD(m) - 0.0800
Maximum(LT)
L = 3.5161 x SD(m) - 0.0792
Long focus zoom lens
ET-DLE350
16 : 10
Minimum(LW)
L = 3.1000 x SD(m) - 0.1351
Maximum(LT)
L = 4.6843 x SD(m) - 0.1346
16 : 9
Minimum(LW)
L = 3.1862 x SD(m) - 0.1351
Maximum(LT)
L = 4.8146 x SD(m) - 0.1346
4 : 3
Minimum(LW)
L = 3.5094 x SD(m) - 0.1351
Maximum(LT)
L = 5.3030 x SD(m) - 0.1346
Ultra long focus zoom lens
ET-DLE450
16 : 10
Minimum(LW)
L = 4.6931 x SD(m) - 0.3017
Maximum(LT)
L = 7.4193 x SD(m) - 0.2991
16 : 9
Minimum(LW)
L = 4.8236 x SD(m) - 0.3017
Maximum(LT)
L = 7.6256 x SD(m) - 0.2991
4 : 3
Minimum(LW)
L = 5.3129 x SD(m) - 0.3017
Maximum(LT)
L = 8.3992 x SD(m) - 0.2991
Note
z
The values obtained from the above formulas may contain slight errors.
z
The throw ratio is based on the value during projection of a 3.81 m (150") size image.
z
When GEOMETRY or KEYSTONE adjustment is used, compensation is made so that the projected image size
becomes smaller than the specified size.
