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Digital Projection Ltd. M-Vision WUXGA Series
Basic calculation example
1.
Calculate the throw ratio using the formula.
Your screen is 4.5m wide and you wish to place the projector
approximately 11m from the screen. The throw ratio will then be
11 ÷ 4.5= 2.44
2. Match the result with the lens table.
The lens matching a throw ratio of 2.44 is the 2.00 - 4.00:1
Zoom lens .
3. Check whether the lens covers the required throw distance.
The focus range quoted for the 2.00 - 4.00:1 Zoom lens
is 1.82 - 41.8m.The required distance of 11m is within the range.
Rev A January 2024
page 102
CHOOSING A LENS
INFORMATION YOU NEED FOR THIS CALCULATION
The throw ratio formula:
Throw Ratio=Throw Distance/Screen Width
Allow a tolerance of +/- 3% in the throw ratio
calculation.
The lens table:
Throw Ratios
0.38:1 fixed
0.9 - 1.2 : 1 zoom
1.20 - 1.56 : 1 zoom
1.50 - 2.00 : 1 zoom
2.00 - 4.00 : 1 zoom
4.00 - 7.00 : 1 zoom
6.9 - 10.3 : 1 zoom
The basic calculation on
this page does not take into
consideration DMD™ and
image size, which could
affect the throw ratio.
See "Full lens calculation"
on page 103 for a more
complex and realistic
Focus Range
calculation.
1.6m - 5m
See "Choosing a lens" on
page 100 for information
0.92m - 10.6m
about individual lens part
numbers.
0.95m - 17.47m
1.24m - 16.4m
1.82m - 41.8m
4.38m - 74.5m
12m - 80m
Notes
Reference Guide
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