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Digital Projection M-Vision 930 Series
Reference Guide
CHOOSING A LENS
Rev C February 2015
Calculating the throw ratio with TRC
1.
For TRC > 1, amend the basic throw ratio formula as follows:
Throw distance
Screen width
x TRC
Throw ratio =
2. Once a throw ratio is established, identify the matching lens from the table:
Throw ratios
Throw distance range
0.84 - 1.03 : 1 zoom lens
1.5 - 10 m (4.9 - 32.8 ft)
1.56 - 1.86 : 1 zoom lens
2 - 12.4 m (6.6 - 40.7 ft)
1.85 - 2.40 : 1 zoom lens
2.5 - 15.9 m (8.2 - 52.2 ft)
2.40 - 4.00 : 1 zoom lens
4 - 26.6 m (13.1 - 87.3 ft)
3.
Ensure the required throw distance is within the range of the matching 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.
