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Basic calculation
Identify the required lens by calculating the throw ratio
A throw ratio is the ratio of the throw distance
Throw Ratio = Throw Distance / Screen Width
1.
Use the formula above to obtain the required throw ratio.
2. Allow a tolerance of +/- 3% in the throw ratio calculation and match
the throw ratio with a lens from the table below:
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
3. Ensure the required throw distance is within the range covered by the lens.
Reference Guide
CHOOSING A LENS
to the screen width
.
2
1
Focus Range
1.6m - 5m
0.92m - 10.6m
0.95m - 17.47m
1.24m - 16.4m
1.82m - 41.8m
4.38m - 74.5m
12m - 80m
2
1
Digital Projection Ltd. M-Vision WUXGA Series
Notes
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
calculation.
When calculating the throw
ratio, be sure to use identical
measurement units for both
the throw distance and the
screen width.
See "Choosing a lens" on
page 100 for information
about individual lens part
numbers.
Rev A January 2024
page 101
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