Digital Projection TITAN XG-500, User Manual

Page: 32 / 120

Page 2.12 Rev C March 2008
2. Installation Digital Projection TITAN XG-500 User Manual
Notes
For more information on using
the Lens shift feature, see
section 4. Using the menus,
Lens menu
.
If the lens is to be shifted in
two directions combined, the
maximum range is somewhat
less, as can be seen below
(zoom lens shift shown).
full horizontal and vertical shift
without distortion
combined shift without distortion
is reduced
Shifting the image
The normal position for the projector is at the centre of the screen. However, you
can set the projector above or below the centre, or to one side, and adjust the image
using the
Lens shift feature to maintain a geometrically correct image.
Any single adjustment outside the ranges speci fi ed below may result in an
unacceptable level of distortion, paricularly at the corners of the image, due to
the image passing through the periphery of the lens optics.
If the lens is to be shifted in two directions combined, the maximum range
without distortion will be somewhat less, as can be seen in the diagrams to the
right.
The maximum range available with no distortion is dependent on which lens is used.
The tables below show the maximum range for images that
fi ll the DMD. For images
which do not use the full height or width, extra shift will be possible, up to the limit of
the lens mount movement.
Fixed lenses
vertical
(pixels) horizontal
(pixels)
vertical
(vs DMD height)
horizontal
(vs DMD width)
123 up
123 down
102 left
102 right
0.16H up
0.16H down
0.1W left
0.1W right
Zoom lenses
vertical
(pixels) horizontal
(pixels)
vertical
(vs DMD height)
horizontal
(vs DMD width)
384 up
123 down
256 left
256 right
0.5H up
0.16H down
0.25W left
0.25W right
It is physically possible to shift the lens further than this, however there will be some
vignetting of the image beyond the ranges speci
fi ed above.
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