Panasonic PT-EW640 Operating Instructions (Functional Manual) page 36

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