Chapter 2
Getting Started — Setting up
ENGLISH - 47
Formula for calculating the projection distance per projection lens
To use a projected image size not listed in this manual, check the projected image 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.)
When calculating a projection distance using image size designation (value in inches), multiply the value in inches
by 0.0254 and substitute it into SD in the formula for calculating the projection distance.
For PT-RZ21K
r
Zoom Lens
Projection lens Model No.
Throw ratio
Aspect ratio
Projection distance (L) formula
Min. (LW)
Max. (LT)
ET-D75LE6
0.924 - 1.10:1
16:10
= 0.7979 x SD
-
0.0566
= 0.9559 x SD
-
0.0736
0.924 - 1.10:1
16:9
= 0.8201 x SD
-
0.0566
= 0.9825 x SD
-
0.0736
1.12 - 1.32:1
4:3
= 0.9032 x SD
-
0.0566
= 1.0822 x SD
-
0.0736
ET-D75LE10
1.30 - 1.67:1
16:10
= 1.1186 x SD -
0.0857
= 1.4458 x SD
-
0.1085
1.30 - 1.67:1
16:9
= 1.1497 x SD
-
0.0857
= 1.4860 x SD
-
0.1085
1.56 - 2.01:1
4:3
= 1.2663 x SD -
0.0857
= 1.6367 x SD -
0.1085
ET-D75LE20
1.67 - 2.41:1
16:10
= 1.4312 x SD
-
0.0832
= 2.0795 x SD
-
0.1162
1.67 - 2.41:1
16:9
= 1.4709 x SD
-
0.0832
= 2.1373 x SD -
0.1162
2.00 - 2.90:1
4:3
= 1.6202 x SD
-
0.0832
= 2.3542 x SD
-
0.1162
ET-D75LE30
2.40 - 4.66:1
16:10
= 2.0647 x SD
-
0.1131
= 4.0041 x SD
-
0.1765
2.41 - 4.66:1
16:9
= 2.1221 x SD -
0.1131
= 4.1155 x SD
-
0.1765
2.89 - 5.60:1
4:3
= 2.3374 x SD
-
0.1131
= 4.5330 x SD
-
0.1765
ET-D75LE40
4.62 - 7.38:1
16:10
= 3.9532 x SD -
0.1577
= 6.3027 x SD
-
0.1615
4.62 - 7.38:1
16:9
= 4.0631 x SD
-
0.1577
= 6.4779 x SD
-
0.1615
5.55 - 8.86:1
4:3
= 4.4754 x SD
-
0.1577
= 7.1351 x SD -
0.1615
ET-D75LE8
7.34 - 13.8:1
16:10
= 6.3193 x SD -
0.3862
= 11.8400 x SD
-
0.3598
7.34 - 13.8:1
16:9
= 6.4950 x SD
-
0.3862
= 12.1692 x SD -
0.3598
8.82 - 16.6:1
4:3
= 7.1540 x SD
-
0.3862
= 13.4039 x SD
-
0.3598
r
Fixed-focus Lens
Projection lens Model No.
Throw ratio
Aspect ratio
Projection distance
(L1) formula
Formula for distance between projector and
screen (A1)
Min.
Max.
ET-D75LE95
0.364:1
16:10
= 0.303 x SD + 0.020
= 0.184 x SH
-
0.128
= 0.283 x SH
-
0.128
0.364:1
16:9
= 0.312 x SD + 0.020
= 0.205 x SH
-
0.128
= 0.370 x SH
-
0.128
0.436:1
4:3
= 0.343 x SD + 0.020
= 0.184 x SH
-
0.128
= 0.283 x SH
-
0.128
ET-D75LE90
0.364:1
16:10
= 0.303 x SD + 0.020
= 0.229 x SH
-
0.128
= 0.283 x SH
-
0.128
0.364:1
16:9
= 0.312 x SD + 0.020
= 0.254 x SH
-
0.128
= 0.370 x SH
-
0.128
0.436:1
4:3
= 0.343 x SD + 0.020
= 0.229 x SH
-
0.128
= 0.283 x SH
-
0.128
Projection lens Model No.
Throw ratio
Aspect ratio
Projection distance (L) formula
ET-D75LE50
0.694:1
16:10
= 0.6072 x SD
-
0.0713
0.695:1
16:9
= 0.6240 x SD
-
0.0713
0.836:1
4:3
= 0.6873 x SD
-
0.0713
