Panasonic PT-TW381R Operating Instructions Manual page 31

Projection distance
A ±5% error in listed projection distances may occur.
When [SCREEN ADJUSTMENT] is used, distance is corrected to become smaller than the specified image size.
Projection
16:10 aspect ratio
size
Projection
Screen
distance
diagonal
(SD)
(L)
1.27 (50") 0.48
1.52 (60") 0.59
1.78 (70") 0.69
2.03 (80") 0.80
2.29 (90") 0.90
2.54 (100") 1.00
Projection distance formulas
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 formulas is m. (Values obtained by the following calculation formulas contain a slight error.)
If you want to calculate the projection distance with projected image size SD (unit: inch) by substituting, please
assign 0.0254 times to the SD value.
Screen height (SH)
Screen width (SW)
Projection distance (L)
Chapter 2 Getting Started - Setting up
Projection
Height position
(H)
0.108
0.129
0.151
0.172
0.194
0.215
16:10 aspect ratio
= 0.530 × SD
= 0.848 × SD
= 0.4085 × SD - 0.0339
16:9 aspect ratio
Height position
distance
(H)
(L)
0.50 0.145
0.60 0.174
0.71 0.203
0.82 0.232
0.92 0.262
1.03 0.291
16:9 aspect ratio
= 0.490 × SD
= 0.872 × SD
= 0.4188 × SD - 0.0339
(Unit: m)
4:3 aspect ratio
Projection
Height position
distance
(H)
(L)
0.55 0.122
0.67 0.146
0.79 0.171
0.91 0.195
1.02 0.219
1.14 0.244
4:3 aspect ratio
= 0.6 × SD
= 0.8 × SD
= 0.4625 × SD - 0.0339
ENGLISH - 31