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Digital Projection Ltd. M-Vision WUXGA Series
Calculating TRC
To calculate TRC, use the following formula:
TRC = 1.6(DMD
Aspect Ratio) / Source Aspect Ratio
TH
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
1.85:1 (Flat)
1920 x 1037 pixels
1.78:1 (16:9)
1920 x 1080 pixels
1.6:1 (16:10)
1920 x 1200 pixels
1.33:1 (4:3)
1596 x 1200 pixels
1.25:1 (5:4)
1500 x 1200 pixels
Calculating the throw ratio with TRC
1.
1. For TRC > 1, amend the basic throw ratio formula as follows:
Throw Ratio = Throw Distance / Screen Width * TRC
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
0.38:1 fixed
0.9 - 1.2 : 1 zoom
1.20 - 1.56 : 1 zoom
1.50 - 2.00 : 1 zoom
2.00 - 4.00 : 1 zoom
4.00 - 7.00 : 1 zoom
6.9 - 10.3 : 1 zoom
3. Ensure the required throw distance is within the range of the matching lens.
Rev A January 2024
page 104
CHOOSING A LENS
TRC < 1, not used
TRC < 1, not used
TRC < 1, not used
TRC < 1, not used (native aspect ratio)
TRC = 1.2
TRC = 1.28
Focus Range
1.6m - 5m
0.92m - 10.6m
0.95m - 17.47m
1.24m - 16.4m
1.82m - 41.8m
4.38m - 74.5m
12m - 80m
Notes
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.
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.
Reference Guide
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