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Digital Projection Ltd. Titan Laser WUXGA
Choosing a lens
Calculating TRC
TRC can only be applied if
greater than 1. If TRC is 1
or less, disregard it and
calculate the throw ratio
using the basic formula.
To calculate TRC, use the following formula:
TRC table
Alternatively, you can save time by referencing the following table, which shows the TRC value for some popular image formats:
2.35:1 (Scope)
1920 x 817 pixels TRC < 1, not used
1.85:1 (Flat)
1920 x 1037 pixels TRC < 1, not used
1.78:1 (16:9)
1920 x 1080 pixels TRC < 1, not used
1.6:1 (16:10)
1920 x 1200 pixels TRC < 1, not used (native aspect ratio)
1.33:1 (4:3)
1596 x 1200 pixels TRC = 1.2
1.25:1 (5:4)
1500 x 1200 pixels TRC = 1.28
Calculating the throw ratio with TRC
TRC can only be applied if
greater than 1. If TRC is 1
or less, disregard it and
calculate the throw ratio
using the basic formula
See Fitting a lens hood on
page 27 for more
information about using
the right lens and hood
1. For TRC > 1, amend the basic throw ratio formula as follows:
Allow a tolerance of +/- 2% in the throw ratio calculation.
2. Once a throw ratio is established, identify the matching lens from the table:
Throw ratios
Focus Range
0.67: 1 Super Wide fixed
1.1m - 10m
1.12 : 1 Wide Fixed
3m - 15m
1.16-1.49:1 Super Wide Zoom
3m - 15m
1.39 - 1.87:1 Wide Zoom
4m - 24m
1.87 - 2.56:1 Standard Zoom
4m - 24m
2.56 - 4.16:1 Semi Long Zoom 9.1m - 45m
4.16 - 6.96:1 Long Zoom1
12m - 80m
6.92 - 10.36:1 Long Zoom2
12m - 80m
3. Ensure the required throw distance is within the range of the matching lens.
The lens table shown on this page includes High Brightness lenses only. For a full list, see
Appendix A
.
Rev A January 2019
page 106
Reference Guide
Notes
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