Choosing A Lens - Digital Projection TITAN sx+ 3D Dual 3D Ultra Contrast User Manual

2. Installation

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:
0.73 : 1 fixed lens
1.2 : 1 fixed lens (3 - 15m)
1.2 : 1 zoom lens (1.2 - 2m)
1.26 - 1.61 : 1 zoom lens
1.5 - 2.02 : 1 zoom lens
2.02 - 2.77 : 1 zoom lens
2.77 - 4.51 : 1 zoom lens
4.51 - 7.53 : 1 zoom lens
7.5 - 11.2 : 1 zoom lens
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 fixed. If, however, you are
using commercially available image processing equipment, such as the Digital
Projection VIP2000, you may be able to resize the image to fit the DMD.
If the image does not fill 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 chart
For the screen sizes listed below, use the chart on the following pages, to choose
the most suitable lens.
any full width image, including:
4:3 = 1.33:1 1400 x 1050 pixels (native resolution)
16:10 = 1.6:1 1400 x 875 pixels
1.66:1 (Vista) 1400 x 843 pixels
16:9 = 1.78:1 1400 x 788 pixels
1.85:1 1400 x 757 pixels
2.35:1 (Scope) 1400 x 596 pixels
Method two: by calculation
See the calculations, on the page immediately following the lens chart.
Page 2.6
Digital Projection
High Brightness High Contrast
105-607 107-195
105-608 105-608
105-609 105-609
109 236 109-359
105-610 107-196
105-611 107-197
105-612 107-198
105-613 107-199
109-235 109-358
TITAN sx+ 3D, Dual 3D, Ultra Contrast
User Manual
Notes
The High Brightness lenses are
recommended for the standard
models, for maximum light
output.
The High Contrast lenses are
recommended for the Ultra
Contrast models, for maximum
contrast.
Each time a new lens is
fitted to the projector,
the calibration procedure
must be carried out. See
Setup menu, in Section 4.
Controlling the projector.
For more information about
Throw ratio factor (TRF), see
Useful lens calculations, later
in this section.
Rev A August 2009