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Choosing a lens
Digital Projection Ltd. Titan Laser WUXGA
Basic calculation
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
1
2
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
Focus Range
0.67: 1 Super Wide fixed
1.1m - 10m
1.12 : 1 Wide Fixed
3m - 15m
1.16-1.49:1 Super Wide Zoom
3m - 15m
1.39 - 1.87:1 Wide Zoom
4m - 24m
1.87 - 2.56:1 Standard Zoom
4m - 24m
2.56 - 4.16:1 Semi Long Zoom 9.1m - 45m
4.16 - 6.96:1 Long Zoom1
12m - 80m
6.92 - 10.36:1 Long Zoom2
12m - 80m
3. Ensure the required throw distance is within the range covered by the lens.
Reference Guide
Rev A January 2019
page 103
Notes