Basic Calculation - Digital Projection M-Vision 930 Series User Manual

Digital Projection
M-Vision 930 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
0.84 - 1.03 : 1 zoom lens 1.5 - 4 m (4.9 - 13.1 ft)
1.56 - 1.86 : 1 zoom lens 2 - 7 m (6.6 - 23 ft)
1.85 - 2.40 : 1 zoom lens 2.5 - 10 m (8.2 - 32.8 ft)
2.40 - 4.00 : 1 zoom lens 4 - 12 m (13.1 - 39.4 ft)
3. Ensure the required throw distance is within the range covered
by the lens.
Rev A January 2014
CHOOSING A LENS
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,
see
section.
When calculating the throw ratio, be
sure to use identical measurement
units for both the throw distance and
the screen width.
Screen width
1
For information about individual lens
Throw distance part numbers, see
2
the end of this document.
Reference Guide
Notes
Full lens calculation
in this
Appendix A at
81