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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.
r Zoom Lens
Projection lens Model No.
ET-D3LEW60/
ET-D75LE6
ET-D3LEW10
ET-D75LE10
ET-D3LES20/
ET-D75LE20
ET-D75LE30
ET-D75LE40
ET-D3LET80/
ET-D75LE8
r Fixed-focus Lens
Projection lens Model No.
ET-D3LEW50/
ET-D75LE50
Projection lens Model No.
ET-D75LE95
ET-D75LE90
52 - ENGLISH
Chapter 2 Getting Started — Setting up
Throw ratio
Aspect ratio
1.00 - 1.18:1
16:10
1.00 - 1.18:1
16:9
1.20 - 1.42:1
4:3
1.35 - 1.84:1
16:10
1.35 - 1.84:1
16:9
1.63 - 2.22:1
4:3
1.39 - 1.79:1
16:10
1.39 - 1.79:1
16:9
1.67 - 2.15:1
4:3
1.79 - 2.59:1
16:10
1.79 - 2.59:1
16:9
2.15 - 3.11:1
4:3
2.58 - 5.00:1
16:10
2.58 - 5.00:1
16:9
3.10 - 6.01:1
4:3
4.95 - 7.91:1
16:10
4.95 - 7.91:1
16:9
5.95 - 9.50:1
4:3
7.87 - 14.8:1
16:10
7.87 - 14.8:1
16:9
9.46 - 17.8:1
4:3
Throw ratio
Aspect ratio
0.746:1
16:10
0.746:1
16:9
0.898:1
Throw ratio
Aspect ratio
0.390:1
16:10
0.390:1
16:9
0.467:1
4:3
0.390:1
16:10
0.390:1
16:9
0.467:1
4:3
Projection distance (L) formula
Min. (LW)
= 0.8549 x SD - 0.0566
= 0.8786 x SD - 0.0566
= 0.9679 x SD - 0.0566
= 1.1163 x SD - 0.0867
= 1.1988 x SD - 0.0867
= 1.3205 x SD - 0.0867
= 1.1985 x SD - 0.0857
= 1.2318 x SD - 0.0857
= 1.3569 x SD - 0.0857
= 1.5334 x SD - 0.0832
= 1.5760 x SD - 0.0832
= 1.7361 x SD - 0.0832
= 2.2121 x SD - 0.1131
= 2.2736 x SD - 0.1131
= 2.5046 x SD - 0.1131
= 4.2356 x SD - 0.1577
= 4.3534 x SD - 0.1577
= 4.7955 x SD - 0.1577
= 6.7707 x SD - 0.3862
= 6.9590 x SD - 0.3862
= 7.6658 x SD - 0.3862
Projection distance (L) formula
4:3
Distance (A1) formula from the projector to
Projection distance
(L1) formula
= 0.325 x SD + 0.020
= 0.198 x SH - 0.128
= 0.334 x SD + 0.020
= 0.220 x SH - 0.128
= 0.368 x SD + 0.020
= 0.198 x SH - 0.128
= 0.325 x SD + 0.020
= 0.245 x SH - 0.128
= 0.334 x SD + 0.020
= 0.272 x SH - 0.128
= 0.368 x SD + 0.020
= 0.245 x SH - 0.128
Max. (LT)
= 1.0242 x SD - 0.0736
= 1.0527 x SD - 0.0736
= 1.1596 x SD - 0.0736
= 1.5939 x SD - 0.1025
= 1.6382 x SD - 0.1025
= 1.8046 x SD - 0.1025
= 1.5490 x SD - 0.1085
= 1.5921 x SD - 0.1085
= 1.7538 x SD - 0.1085
= 2.2280 x SD - 0.1162
= 2.2900 x SD - 0.1162
= 2.5226 x SD - 0.1162
= 4.2901 x SD - 0.1765
= 4.4094 x SD - 0.1765
= 4.8573 x SD - 0.1765
= 6.7529 x SD - 0.1615
= 6.9406 x SD - 0.1615
= 7.6456 x SD - 0.1615
= 12.6858 x SD - 0.3598
= 13.0385 x SD - 0.3598
= 14.3627 x SD - 0.3598
= 0.6505 x SD - 0.0713
= 0.6686 x SD - 0.0713
= 0.7365 x SD - 0.0713
the screen
Min.
Max.
= 0.339 x SH - 0.128
= 0.432 x SH - 0.128
= 0.339 x SH - 0.128
= 0.339 x SH - 0.128
= 0.432 x SH - 0.128
= 0.339 x SH - 0.128
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