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Digital Projection HIGHlite 740 Series
Calculating the throw ratio with TRC
1.
For TRC > 1, amend the basic throw ratio formula as follows:
Throw distance
Throw ratio =
Screen width x TRC
2.
Once a throw ratio is established, identify the matching lens from the table:
Throw ratios
Throw distance range
0.77 : 1 fixed lens
1.3 - 2.5 m (4.3 - 8.2 ft)
1.16 : 1 fixed lens
1.4 - 6.2 m (4.6 - 20.3 ft)
1.45 - 1.74 : 1 zoom lens
1.8 - 9.3 m (5.9 - 30.5 ft)
1.74 - 2.17 : 1 zoom lens
2.2 - 11.8 m (7.2 - 38.7 ft)
2.17 - 2.90 : 1 zoom lens
2.7 - 15.4 m (8.9 - 50.5 ft)
2.90 - 4.34 : 1 zoom lens
3.6 - 22.5 m (11.8 - 73.8 ft)
4.34 - 6.76 : 1 zoom lens
5.5 - 35 m (18 - 115 ft)
3.
Ensure the required throw distance is within the range of the matching lens.
Reference Guide
CHOOSING A LENS
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.
Rev I February 2015
page 85
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