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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
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
0.67 : 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
2
1
to the screen width
:
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 111
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
the previous page 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 B September 2019
page 109
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