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Digital Projection
HIGHlite 8000 Series
Choosing a lens by calculation
Basic calculation
Identify the required lens by calculating the throw ratio.
A throw ratio is the ratio of the throw distance to the screen width:
DMD width
Throw ratio factor =
Image width in pixels
Throw distance
Throw ratio =
Screen width
1.
Use the formula above to obtain the required throw ratio.
Throw distance
Throw ratio =
Screen width x Throw ratio factor
2.
Match the throw ratio with a lens from the table below:
Throw ratios
0.77 : 1 fixed lens
1.16 : 1 fixed lens
1.45 - 1.74 : 1 zoom lens
1.74 - 2.17 : 1 zoom lens
2.17 - 2.90 : 1 zoom lens
2.90 - 4.34 : 1 zoom lens
4.34 - 6.76 : 1 zoom lens
3.
Ensure the required throw distance is within the range covered by the lens.
Rev F July 2014
Throw distance range
1.3 - 2.5 m (4.3 - 8.2 ft)
1.4 - 6.2 m (4.6 - 20.3 ft)
1.8 - 9.3 m (5.9 - 30.5 ft)
2.2 - 11.8 m (7.2 - 38.7 ft)
2.7 - 15.4 m (8.9 - 50.5 ft)
3.6 - 22.5 m (11.8 - 73.8 ft)
5.5 - 35 m (18 - 115 ft)
CHOOSING A LENS
1
2
The basic calculation on this page
does not take into consideration
DMD™ and image size, which could
affect the throw ratio. For a more
complex and realistic calculation,
see
section.
When calculating the throw ratio, be
Screen width
1
sure to use identical measurement
units for both the throw distance and
Throw distance
2
the screen width.
For information about individual lens
part numbers, see
the end of this document.
Reference Guide
Notes
Full lens calculation
in this
Appendix A
at
45
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