Installation and Setup
Mirage M Series User Manual
23
020-101942-02 Rev. 1 (10-2018)
Throw distance
Throw distance is the distance measured from the front feet of the projector to the screen. This
calculation determines if there is enough room to install your projector with a desired screen size
and if the image is the right size for your screen.
Use the lens and screen size to calculate the precise throw distance using the lens throw calculator
provided in the Dealer Section of the Christie website, or use the tables provided in the
M Series
Lens Throw Ratios document
(P/N: 020-100221-XX)
. Due to lens manufacturing tolerances for lens
focal length, actual throw distance can vary ±5% between lenses with the same nominal throw
ratio.
To estimate the throw distance take the horizontal width of the screen and multiply it by the lens
throw ratio. The result determines approximately the distance the projector should be positioned
from the screen to project a focused image large enough to fill the screen. For example, using a
0.73:1 lens, throw distance would roughly be 0.73 times the screen width.
Vertical and horizontal position
The correct vertical and horizontal position of the projector in relation to the screen depends on the
lens type and the screen size. Ideally, the projector should be positioned perpendicular to the
screen. This way, the image appears rectangular instead of keystoned (trapezoidal).
The vertical position of the image can be offset (moved above or below the optical axis) by
adjusting the motorized lens mount. The amount of vertical offset available depends on the type of
lens installed in the projector and can be limited if horizontal offset has been applied. Vertical offset
can be expressed as the percent of half the image height or the number of pixels of shift from lens
center.
• Offsets are subject to ±7% centering tolerance.
• % Offset = number of pixels of offset/half vertical panel resolution x 100.
WUXGA Vertical Offset Ranges
WUXGA lens description
Lens part
number
Minimum offset above
or below lens center
Lens ILS 0.73:1SX+/0.67:1HD
118-100110-XX
±22%
±132 pixels
Lens ILS 1.25-1.6SX+/1.16-1.49HD
118-100111-XX
±82%
±492 pixels
ALL OTHER LENSES
±112%
±672 pixels
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