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Digital Projection Mercury Quad 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 distance
Throw ratio =
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 ratio
Throw distance range
0.67:1 fixed lens
1.1 m - 10 m (3.6 ft - 33 ft)
1.12:1 fixed lens
3 m - 15 m (9.8 ft - 49.2 ft)
1.16 - 1.49:1 zoom lens
3 m - 15 m (9.8 ft - 49.2 ft)
1.39 - 1.87:1 zoom lens
4 m - 24 m (13.1 ft - 78.7 ft)
1.87 - 2.56:1 zoom lens
4 m - 24 m (13.1 ft - 78.7 ft)
2.56 - 4.16:1 zoom lens
9.1 m - 45 m (29.9 ft - 147.6 ft)
4.16 - 6.96:1 zoom lens
12 m - 80 m (39.3 ft - 262.5 ft)
6.92 - 10.36:1 zoom lens
12 m - 80 m (39.3 ft - 262.5 ft)
3.
Ensure the required throw distance is within the range covered
by the lens.
Reference Guide
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
sure to use identical measurement
units for both the throw distance and
the screen width.
Screen width
1
For information about individual lens
Throw distance
part numbers, see
2
the end of this document.
Notes
Full lens calculation
in this
Appendix A
at
Rev A March 2017
page 90
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