page 82
Digital Projection E-Vision Laser 7500, 8500 & 10K Series
Reference Guide
CHOOSING A LENS
Rev D August 2017
Basic calculation
Identify the required lens by calculating the
throw ratio
.
A
throw ratio
is the ratio of the throw distance to the screen width:
Throw distance
Screen width
Throw ratio =
1. Use the formula above to obtain the required throw ratio.
2. Match the throw ratio with a lens from the table below:
Throw ratios
Focus range
0.82 m - 2.71 m
1.02 m - 12.7 m
0.81 m - 5.08 m
1.33 m - 11.73 m
1.83 m - 14.9 m
2.36 m - 24.2 m
3.8 m - 35.35 m
0.38 : 1 fixed (UST)
0.75 - 0.93 : 1 zoom
0.76 : 1 fixed
1.25 - 1.79 : 1 zoom
1.7
3
- 2.27 : 1 zoom
2.22 - 3.67 : 1 zoom
3.58 - 5.38 : 1 zoom
5.31 - 8.26 : 1 zoom
5.59 m - 54.8 m
3. Ensure the required throw distance is within the range covered by the lens.
Notes
The basic calculation on this page
does not take into consideration
DMD™ and image size, which could
affect the throw ratio. For a more
complex and realistic calculation,
in this
section.
When calculating the throw ratio, be
sure to use identical measurement
units for both the throw distance and
the screen width.
For information about individual lens
the end of this document.
1
2
1
Throw distance
2
Screen width
