Chapter 2
Getting Started — Before the installation
34 - ENGLISH
Projection distance
The dimension in the following table contains a slight error.
Also, it is corrected to become smaller than the specified image size when [KEYSTONE] is used.
r
When the image aspect ratio is 4:3
(Unit: m)
Projected image size
Projection distance (L)
Distance from the
lens center to the
image end (H)
Diagonal (SD)
Height (SH)
Width (SW)
Min. (LW)
Max. (LT)
0.76 (30")
0.457
0.610
0.79
1.75
0.152
1.02 (40")
0.610
0.813
1.06
2.35
0.203
1.27 (50")
0.762
1.016
1.34
2.94
0.254
1.52 (60")
0.914
1.219
1.62
3.54
0.305
1.78 (70")
1.067
1.422
1.89
4.14
0.356
2.03 (80")
1.219
1.626
2.17
4.73
0.406
2.29 (90")
1.372
1.829
2.45
5.33
0.457
2.54 (100")
1.524
2.032
2.72
5.92
0.508
3.05 (120")
1.829
2.438
3.28
7.12
0.610
3.81 (150")
2.286
3.048
4.10
8.90
0.762
5.08 (200")
3.048
4.064
5.48
11.88
1.016
Projection distance formula
To use an image size not listed in this manual, check the projected image size SD (m) and use the respective
formula to calculate projection distance (L).
The unit of the formula is all “m”. (Value obtained by the following calculation formula contains 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.
r
When the image aspect ratio is 4:3
Minimum projection distance (LW)
L = 1.0907 × SD - 0.0507
Maximum projection distance (LT)
L = 2.3468 × SD - 0.0379
