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Digital Projection E-Vision Laser WQ120 Series
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:
Throw ratio =
Throw distance
Screen width
1.
Use the formula above to obtain the required throw ratio.
2.
Match the throw ratio with a lens from the table below:
Throw ratios
Focus range
0.79 - 0.99 : 1 zoom
1.02 m - 12.7 m
1.32 - 1.89 : 1 zoom
1.33 m - 11.73 m
1.82 - 2.40 : 1 zoom
1.83 m - 14.9 m
2.34 - 3.90 : 1 zoom
2.36 m - 24.2 m
3.
Ensure the required throw distance is within the range covered by the lens.
CHOOSING A LENS
Throw distance
1
Screen width
2
1
2
Notes
The lens table shown on this page
includes High Brightness lenses
only. For a full list, see
Appendix A
at the end of this document.
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
Full lens calculation
in this
section.
When calculating the throw ratio, be
sure to use identical measurement
units for both the throw distance and
the screen width.
For information about individual lens
part numbers, see
Appendix A
at
the end of this document.
Rev A May 2018
page 70
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