Digital Projection TITAN XG-500, User Manual

Page: 26 / 120

Page 2.6 Rev C March 2008
2. Installation Digital Projection TITAN XG-500 User Manual
Notes
For more information about
Throw ratio factor (TRF), see
Useful lens calculations , later
in this section.
Choosing a lens
A number of lenses are available for use with the projector. Which lens you choose
will depend on the screen size, image aspect ratio, projection distance and light
output.
The lenses available and their part numbers are listed below:
0.8 : 1 fi xed lens 001-734
1.2 : 1 fi xed lens 001-735
1.5 - 1.8 : 1 zoom lens 001-736
1.8 - 2.25 : 1 zoom lens 001-737
2.25 - 3.0 : 1 zoom lens 001-738
3.0 - 4.5 : 1 zoom lens 001-739
4.5 - 7.0 : 1 zoom lens 001-740
If you are simply connecting the output of a camera or computer directly to the
projector, then the image size (in pixels) may well be
fi xed. If, however, you are
using commercially available image processing equipment, such as the Digital
Projection VIP1000, you may be able to resize the image to
fi t the DMD.
If the image does not fi ll the full width of the DMD, this effectively increases the
throw ratio of the lens. This can be corrected for by applying a Throw ratio factor.
Method one: using the lens charts
For the screen sizes listed below, use the charts on the following pages, to choose
the most suitable lens.
Full width images, including:
2.35:1 (Scope) 1024 x 435 pixels
1.85:1 1024 x 553 pixels
16:9 = 1.78:1 1024 x 576 pixels
1.66:1 (Vista) 1024 x 616 pixels
4:3 = 1.33:1 1024 x 768 pixels (native resolution)
Full height images
A Throw ratio factor (TRF) has been applied to the following chart:
5:4 = 1.25:1 960 x 768 pixels TRF = 1.07
Method two: by calculation
See the calculations, on the page immediately following the lens chart.