Christie roadie 25k User Manual page 166

THROW DISTANCE
Lens Throw Ratio
1:1 fixed
1.25 – 1.45:1 zoom
1.45 – 1.8:1 zoom
1.8 – 2.4:1 zoom
2.2 – 3.0:1 zoom
3.0 – 4.3:1 zoom
4.3 – 6.0:1 zoom
5.5 – 8.5:1 zoom
Throw Distance Tables
D-2
Roadie 25K User's Manual
Throw Distance Formula (cm) ±5%
1.03 x screen width (
Min:1.26 x screen width (
Max: 1.46 x screen width (
Min: 1.45 x screen width (
Max: 1.81 x screen width (
Min: 1.80 x screen width (
Max: 2.41 x screen width (
Min: 2.24 x screen width (
Max: 3.05 x screen width (
Min: 3.05 x screen width (
Max: 4.35 x screen width (
Min: 4.37 x screen width (
Max: 6.16 x screen width (
Min: 5.59 x screen width (
Max: 8.71 x screen width (
NOTES: 1) Make sure to use HORIZONTAL screen width in all formulas. 2) Throw distance can often be exceeded with negligible
loss of focus. 3) Throw ratios, formulas and throw distances apply to both standard and optional high-contrast lenses.
'
Based on the formulas provided in Table D.1, a selection of pre-calculated throw
distances for each lens type appears in the charts on the following pages. Refer to
these examples to quickly determine a proper throw distance (±5%) for your
installation and lens, or to determine what zoom range of image size is possible at a
given throw distance.
Keep in mind that ambient light, screen material, lamp size, image content and other
variables at your site may affect whether or not a given throw distance—and resulting
image size—will be ideal for your installation.
NOTE: Throw ratios, formulas and throw distances apply to both standard and
optional high-contrast lenses.
Table D.1. Throw Distance Formulas
Min. Throw Distance
cm) + 28.3 5m (15 ft.)
cm) + 25.9 5m (15 ft.)
cm) + 23.5
cm) + 18.4 5m (15 ft.)
cm) + 16.8
cm) + 17.9 5m (15 ft.)
cm) + 15.1
cm) + 9.6 5m (15 ft.)
cm) + 4.0
cm) + 2.5 5m (15 ft.)
cm) + .04
cm) + 7.3 9m (30 ft.)
cm) + 3.0
cm) + 10.1 9m (30 ft.)
cm) + 1.2
Approx. Max.Screen Width ( )
44m (145 ft.)
44m (145 ft.)
44m (145 ft.)
44m (145 ft.)
44m (145 ft.)
44m (145 ft.)
44m (145 ft.)
44m (145 ft.)