When using ratios to select a lens, you must consider the screen width and
the projection distance to the screen. The formula is distance/width.
For example, if you had a 10' wide screen and a projection distance of 10',
you would require a lens with a 1:1 ratio. If your distance changed to
20', you would then require a lens with a 2:1 ratio. However, due to the
different LCD panel sizes, the actual focal length of the required lens would
be different for each panel size, even though the ratio would remain the same.
LCD Panel Size
Ratios
FL "
FL mm
0.9"
*
1.38
: 1
1.0
25.4
1.68
: 1
1.2
30.0
2.78
- 3.82 : 1
2.0
- 2.75
50
- 70
3.82
- 6.94 : 1
2.75
- 5.0
70
- 125
7.22
- 12.1 : 1
5.2
- 8.7
132
- 220
0.99"
1.26
: 1
1.0
25.4
1.5
: 1
1.2
30.0
3.0
: 1
2.4
60.0
2.53
- 3.47 : 1
2.0
- 2.75
50
- 70
3.47
- 6.3 : 1
2.75
- 5.0
70
- 125
6.57
- 11.0 : 1
5.2
- 8.7
132
- 220
7.6
- 11.3 : 1
6.0
- 9.0
150
- 230
1.3"
0.94
: 1
1.0
25.4
1.15
: 1
1.2
30.0
1.23
- 1.73 : 1
1.2
- 1.8
32.5
- 45.7
2.7
- 4.8 : 1
2.75
- 5.0
70
- 125
4.4
- 7.0 : 1
4.56
- 7.29
115
- 185
5.0
- 8.3 : 1
5.2
- 8.7
132
- 220
5.8
- 8.6 : 1
6.0
- 9.0
150
- 230
7-1
- 11.3 : 1
7.38
- 12.3
187
- 312
1.35"
0.86
: 1
1.0
25.4
1.0
: 1
1.2
30.0
2.4
- 4.2 : 1
2.75
- 5.0
70
- 125
4.5
- 7.3 : 1
5.2
- 8.7
132
- 220
1.4"
4.0 - 6.8 : 1
4.49 - 7.72
114 - 196
4.7 - 7.7 : 1
5.2 - 8.7
132 - 220
6.6 -
10.9 : 1
7.38 -
12.3
187 -
312
1.8"
1.0 : 1
1.5
38.0
3.1 -
5.0 : 1
4.56
- 7.29
115 -
185
4.2
- 6.2 : 1
6.0
- 9.0
150
- 230
5.2 -
8.5 : 1
7.38
- 12.3
187 -
312
1.8"
Large Venue
3.1
- 5.3 : 1
4.49
- 7.72
114
- 196
5.0 -
8.6 : 1
7.25
- 12.38
184 -
314
*
For use with 0.9" LCD projectors where it is possible to change lenses.
Other more compact models require the use of a wide-angle or long-throw
conversion lens, which is placed in front of the prime lens.
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