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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 to the screen width:
1. Use the formula above to obtain the required throw ratio.
2. Allow a tolerance of +/- 2% in the throw ratio calculation and match the throw ratio with a
lens from the table below:
Throw ratios
0.67: 1 Super Wide fixed
1.12 : 1 Wide Fixed
1.16-1.49:1 Super Wide Zoom 3m - 15m
1.39 - 1.87:1 Wide Zoom
1.87 - 2.56:1 Standard Zoom
2.56 - 4.16:1 Semi Long Zoom 9.1m - 45m
4.16 - 6.96:1 Long Zoom1
6.92 - 10.36:1 Long Zoom2
3. Ensure the required throw distance is within the range covered by the lens.
Reference Guide
Focus Range
1.1m - 10m
3m - 15m
4m - 24m
4m - 24m
12m - 80m
12m - 80m
Choosing a lens
1
2
Digital Projection Ltd. Titan Laser WUXGA
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 105
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 lens part numbers on
page 115 for information
about individual lens part
numbers
See Fitting a lens hood on
page 27 for more
information about using
the right lens and hood
Rev A January 2019
page 103
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