Basic calculation example
1. Calculate the throw ratio using the formula.
Your screen is 4.5 m wide and you wish to place your
WUXGA projector approximately 11 m from the screen.
The throw ratio will then be
11
4.5
= 2.44
2. Match the result with the lens table.
The lenses matching a throw ratio of 2.44 are:
• the 1.87 - 2.56 : 1 zoom lens
• the 1.72 - 2.71 : 1 zoom lens
• the 2.15 - 3.36 : 1 zoom lens
3. Check whether the lens covers the required throw
distance.
The range quoted for the 1.87 - 2.56 : 1 zoom lens is 4 m
- 24 m. The required distance of 11 m is within the range.
The other two lenses have a range of 5 m - 25 m, also
within the range.
Notes
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.
You can also use the information
in Appendix B: Lens Charts to
choose a lens.
For information about individual lens
part numbers, see Appendix A:
Lens Part Numbers at the end of
this document.
INFORMATION YOU NEED FOR THIS CALCULATION
• The throw ratio formula:
Throw distance
Screen width
Throw ratio =
• The lens table:
Throw ratios for 1080p and WUXGA Throw distance range
0.67 : 1 xed lens 1.1 m - 10 m (3.6 ft - 32.8 ft)
1.12 : 1 xed lens (3 m - 15 m) 3 m - 15 m (9.8 ft - 49.2 ft)
1.12 : 1 xed lens (1.2 m - 2 m) 1.2 m - 2 m (3.9 ft - 6.6 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 - 4.17 : 1 zoom lens 9.1 m - 45 m (29.9 ft - 147.6 ft)
4.17 - 6.95 : 1 zoom lens 12 m - 80 m (39.4 ft - 262.5 ft)
6.93 - 10.34 : 1 zoom lens 12 m - 80 m (39.4 ft - 262.5 ft)
1.50 - 2.17 : 1 zoom lens 5 m - 25 m (16.4 ft - 82 ft)
1.72 - 2.71 : 1 zoom lens 5 m - 25 m (16.4 ft - 82 ft)
2.15 - 3.36 : 1 zoom lens 5 m - 25 m (16.4 ft - 82 ft)
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