Shifting The Image - NEC iS15-2K User Manual

2. Installation

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 specified 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 fill 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.
vertical horizontal
(pixels) (pixels)
± 282 ± 172
It is physically possible to shift the lens further than this, up to the number of pixels
shown in the diagram to the right. However:
• There will be some distortion of the image beyond the ranges specified above.
• Due to internal hardware layout, the shift towards the upper-right is limited as
shown in the diagram.
• Due to continuing product development, these figures may vary by ±25 pixels.
vertical horizontal
(vs DMD height) (vs DMD width)
± 0.26H ± 0.085W
iS15-2K
page 2.18
Cinema Projector: User Manual
Notes
For more information on
adjusting the projection lens,
see Displaying a test pattern
and Adjusting the projected
image in section 3. Getting
started.
If the lens is to be shifted in two
directions combined, the
maximum range is somewhat
less, as can be seen below.
full horizontal and vertical shift
without distortion
combined shift without distortion
is reduced
520
(0.48H)
135
384
(0.19W)
560
(0.52H)
total lens mount shift available
in pixels and vs DMD size
449
640
(0.31W)