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
Screen width
Throw ratio =
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 for 1080p and WUXGA Throw ratios for SX+ Throw distance range
0.67 : 1 xed lens 0.73 : 1 xed lens 1.1 m - 10 m (3.6 ft - 32.8 ft)
1.12 : 1 xed lens (3 m - 15 m) 1.21 : 1 (3 m - 15 m) xed lens 3 m - 15 m (9.8 - 49.2 ft)
1.12 : 1 xed lens (1.2 m - 2 m) 1.21 : 1 (1.2 m - 2.0 m) xed lens 1.2 m - 2 m (3.9 - 6.6 ft)
1.16 - 1.49 : 1 zoom lens 1.26 - 1.61 : 1 zoom lens 3 m - 15 m (9.8 - 49.2 ft)
1.39 - 1.87 : 1 zoom lens 1.5 - 2.02 : 1 zoom lens 4 m - 24 m (13.1 - 78.7 ft)
1.87 - 2.56 : 1 zoom lens 2.02 - 2.77 : 1 zoom lens 4 m - 24 m (13.1 - 78.7 ft)
2.56 - 4.17 : 1 zoom lens 2.77 - 4.51 : 1 zoom lens 9.1 m - 45 m (29.9 - 147.6 ft)
4.17 - 6.95 : 1 zoom lens 4.51 - 7.53 : 1 zoom lens 12 m - 80 m (39.4 - 262.5 ft)
6.93 - 10.34 : 1 zoom lens 7.5 - 11.2 : 1 zoom lens 12 m - 80 m (39.4 - 262.5 ft)
1.50 - 2.17 : 1 zoom lens 1.63 - 2.35 : 1 zoom lens 5 m - 25 m (16.4 - 82 ft)
1.72 - 2.71 : 1 zoom lens 1.86 - 2.93 : 1 zoom lens 5 m - 25 m (16.4 - 82 ft)
2.15 - 3.36 : 1 zoom lens 2.33 - 2.64 : 1 zoom lens 5 m - 25 m (16.4 - 82 ft)
3. Ensure the required throw distance is within the range covered by the lens.
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.
When calculating the throw ratio, be
sure to use identical measurement
units for both the throw distance and
the screen width.
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.
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