Digital Projection LIGHTNING 30/40/45-1080p, Руководство пользователя

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Rev B. January 2010 Page 2.13
Digital Projection
LIGHTNING 1080p, 1080p 3D/UC
User Manual 2. Installation
Notes
The Throw ratio for a particular
lens is fixed, but assumes that
the image fills the width of the
DMD.
For images that do not fill the
width of the DMD, the Throw
ratio is effectively increased.
To correct for this in these
calculations, a Throw Ratio
Factor (TRF) is used.
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.
Lens extension is measured
when the lens is focussed at
infinity, and fully extended.
At other focus settings, the
extension could be up to 10mm
less
Useful lens calculations
The following lens calculations may be useful:
Throw ratio = Throw distance
Screen width
Throw ratio factor (TRF) = DMD width in pixels = 1920
image width in pixels image width in pixels
Therefore:
Screen width = Throw distance
Throw ratio x TRF
Throw distance = Screen width x Throw ratio x TRF
Lens extension
The throw distance calculated above is to the outer end of the lens. For each lens,
the nominal distance between the front of the projector and the outer end of the lens
(lens extension) will be as listed below.
High Brightness/ Contrast Lens extension (±2%)
0.67 : 1 fixed lens 105-607 107-195 204 mm (8.0 in)
1.12 : 1 fixed lens (3 - 15m) 105-608 105-608 268 mm (10.6 in)
1.12 : 1 fixed lens (1.2 - 2m) 105-609 105-609 268 mm (10.6 in)
1.16 - 1.49 : 1 zoom lens 109 236 109-359 226 mm (8.9 in)
1.39 - 1.87 : 1 zoom lens 105-610 107-196 194 mm (7.6 in)
1.87 - 2.56 : 1 zoom lens 105-611 107-197 159 mm (6.3 in)
2.56 - 4.16 : 1 zoom lens 105-612 107-198 145 mm (5.7 in)
4.16 - 6.96 : 1 zoom lens 105-613 107-199 129 mm (5.1 in)
6.92 - 10.36 : 1 zoom lens 109-235 109-358 179 mm (7.0 in)
lens extension,
measured from front
of corner post