Digital Projection Ltd. E-Vision Laser 13000 WU Series 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
1. For TRC > 1, amend the basic throw ratio formula as follows:
Allow a tolerance of +/- 3% in the throw ratio calculation.
2. Once a throw ratio is established, identify the matching lens from the table:
Throw ratios Focus range
0.377 : 1 fixed (UST) 0.82 m - 2.71 m
0.75 - 0.93 : 1 zoom 1.02 m - 12.7 m
0.76 : 1 fixed 0.81 m - 5.08 m
1.25 - 1.79 : 1 zoom 1.33 m - 11.73 m
1.73 - 2.27 : 1 zoom 1.83 m - 14.9 m
2.22 - 3.67 : 1 zoom 2.36 m - 24.2 m
3.58 - 5.38 : 1 zoom 3.8 m - 35.35 m
5.31 - 8.26 : 1 zoom 5.59 m - 54.8 m
3. Ensure the required throw distance is within the range of the matching lens.
Rev A June 2019
page 98
Reference Guide
Notes
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