Basic Calculation - Digital Projection HIGHlite 660 3D Series Installation And Quick Start Manual

Digital Projection HIGHlite 660 3D Series

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
Throw ratio =
Screen width
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 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 covered by the lens.
Reference Guide
CHOOSING A LENS
1
2
1
2
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,
Full lens calculation
see
section.
When calculating the throw ratio, be
Screen width
sure to use identical measurement
units for both the throw distance and
Throw distance
the screen width.
For information about individual lens
part numbers, see
the end of this document.
Notes
in this
Appendix A
at
Rev E February 2015
page 95