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Chapter 2 Getting Started — Setting up
36 - 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.)
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.
For PT-EZ580
Lens type
Projection Lens
Model No.
Aspect ratio Projection distance (L) formula
Standard zoom lens —
16:10
Min. (LW) L = 1.3900 x SD
-
0.0549
Max. (LT) L = 2.3640 x SD
-
0.0482
16:9
Min. (LW) L = 1.4286 x SD
-
0.0549
Max. (LT) L = 2.4297 x SD
-
0.0482
4:3
Min. (LW) L = 1.5736 x SD
-
0.0549
Max. (LT) L = 2.6763 x SD
-
0.0482
Fixed-focus lens ET-ELW21
16:10 — L = 0.6763 x SD
-
0.0577
16:9 — L = 0.6951 x SD
-
0.0577
4:3 — L = 0.7656 x SD
-
0.0577
Short focus zoom lens ET-ELW20
16:10
Min. (LW) L = 1.0557 x SD
-
0.0555
Max. (LT) L = 1.4374 x SD
-
0.0534
16:9
Min. (LW) L = 1.0851 x SD
-
0.0555
Max. (LT) L = 1.4774 x SD
-
0.0534
4:3
Min. (LW) L = 1.1952 x SD
-
0.0555
Max. (LT) L = 1.6273 x SD
-
0.0534
Long focus zoom lens ET-ELT20
16:10
Min. (LW) L = 2.3662 x SD
-
0.1140
Max. (LT) L = 3.8583 x SD
-
0.1129
16:9
Min. (LW) L = 2.4320 x SD
-
0.1140
Max. (LT) L = 3.9656 x SD
-
0.1129
4:3
Min. (LW) L = 2.6788 x SD
-
0.1140
Max. (LT) L = 4.3680 x SD
-
0.1129
Ultra long focus zoom lens ET-ELT21
16:10
Min. (LW) L = 3.8667 x SD
-
0.2123
Max. (LT) L = 6.1416 x SD
-
0.2108
16:9
Min. (LW) L = 3.9742 x SD
-
0.2123
Max. (LT) L = 6.3123 x SD
-
0.2108
4:3
Min. (LW) L = 4.3775 x SD
-
0.2123
Max. (LT) L = 6.9529 x SD
-
0.2108
For PT-EW640 and PT-EW540
Lens type
Projection Lens
Model No.
Aspect ratio Projection distance (L) formula
Standard zoom lens —
16:10
Min. (LW) L = 1.4062 x SD
-
0.0504
Max. (LT) L = 2.3944 x SD
-
0.0497
16:9
Min. (LW) L = 1.4452 x SD
-
0.0504
Max. (LT) L = 2.4609 x SD
-
0.0497
4:3
Min. (LW) L = 1.5919 x SD
-
0.0504
Max. (LT) L = 2.7106 x SD
-
0.0497
Fixed-focus lens ET-ELW21
16:10 — L = 0.6842 x SD
-
0.0572
16:9 — L = 0.7032 x SD
-
0.0572
4:3 — L = 0.7746 x SD
-
0.0572
Short focus zoom lens ET-ELW20
16:10
Min. (LW) L = 1.0702 x SD
-
0.0554
Max. (LT) L = 1.4530 x SD
-
0.0534
16:9
Min. (LW) L = 1.1000 x SD
-
0.0554
Max. (LT) L = 1.4934 x SD
-
0.0534
4:3
Min. (LW) L = 1.2116 x SD
-
0.0554
Max. (LT) L = 1.6449 x SD
-
0.0534