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Digital Projection M-Vision 930 Series
Basic calculation example
1.
Calculate the throw ratio using the formula.
Your screen is 3.5 m wide and you wish to place the projector
approximately 6.8 m from the screen. The throw ratio will then
be
6.8
= 1.94
3.5
2.
Match the result with the lens table.
The lens matching a throw ratio of 1.94 is the 1.85 - 2.40 : 1
zoom lens.
3.
Check whether the lens covers the required throw distance.
The range quoted for the 1.85 - 2.40 : 1 zoom lens is
2.5 - 15.9 m. The required distance of 6.8 m is within the range.
Reference Guide
CHOOSING A LENS
INFORMATION YOU NEED FOR THIS CALCULATION
•
The throw ratio formula:
Throw distance
Throw ratio =
Screen width
•
The lens table:
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)
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,
Full lens calculation
see
in this
section.
For information about individual lens
part numbers and lens extension
Appendix A
sizes, see
at the end of
this document.
Rev C February 2015
page 76
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