Calculating The Throw Ratio With Trc - Digital Projection E-Vision Laser 4K Series User Manual

Digital Projection E-Vision Laser 4K 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 Focus range
0.38 : 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
1.72 - 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.
Reference Guide
CHOOSING A LENS
Notes
The lens table shown on this page
includes High Brightness lenses
only. For a full list, see Appendix A
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.
Rev A June 2017
page 90