page 74
Digital Projection E-Vision Laser WQ120 Series
CHOOSING A LENS
Rev A May 2018
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
Focus range
0.79 - 0.99 : 1 zoom
1.02 m - 12.7 m
1.32 - 1.89 : 1 zoom
1.33 m - 11.73 m
1.82 - 2.40 : 1 zoom
1.83 m - 14.9 m
2.34 - 3.90 : 1 zoom
2.36 m - 24.2 m
3. Ensure the required throw distance is within the range of the matching lens.
Notes
The lens table shown on this page
includes High Brightness lenses
only. For a full list, see
at the end of this document.
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.
