Digital Projection 35HD-T, Руководство пользователя

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Page 2.6 105-453B January 2007
2. Installation Digital Projection LIGHTNING 35HD-T, 40HD-T 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 and projection distance.
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 MMS 1000, 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 one of the charts on the following pages, to
choose a lens.
any full width image, including:
native resolution 2048 x 1080 pixels
2.35:1 full width 2048 x 871 pixels
A Throw ratio factor (TRF) has been applied to the following charts:
16:9 full height 1920 x 1080 pixels
4:3 full height 1440 x 1080 pixels
5:4 full height 1350 x 1080 pixels
4:3 unresized 1024 x 768 pixels
5:4 unresized 1280 x 1024 pixels
Method two: by calculation
See the calculations, on the page immediately following the lens charts.