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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 - 10 m (4.9 - 32.8 ft)
1.56 - 1.86 : 1 zoom lens
2 - 12.4 m (6.6 - 40.7 ft)
1.85 - 2.40 : 1 zoom lens
2.5 - 15.9 m (8.2 - 52.2 ft)
2.40 - 4.00 : 1 zoom lens
4 - 26.6 m (13.1 - 87.3 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
sure to use identical measurement
units for both the throw distance and
the screen width.
Screen width
For information about individual lens
Throw distance
part numbers and lens extension
sizes, see
this document.
Notes
in this
Appendix A
at the end of
Rev C February 2015
page 75
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