Installation
Mirage WQ-L User Manual
18
020-101372-01 Rev. 1 (04-2014)
image large enough to fill the screen. For example, using a 1.28 - 1.71 zoom lens set at its widest
(1.2:1) throw ratio, throw distance would roughly be 1.2 x screen width.
1. The left and right horizontal offset examples are based on the projector being in the normal
landscape orientation and looking towards the front of the projector from the back (input panel
side).
• Offsets are subject to ±7% centering tolerance.
• Image size outside the specified width range may result in reduced image quality.
• Throw distance is measured from the marked exit pupil position on the lens to the
screen. Throw ratio is defined as:
• 100% offset is defined as having all pixels shifted beyond the projector optical axis.
• Offsets are measured from the optical lens centre, which may not coincide with the
mechanical centre.% offset is defined as:
Determine Vertical and Horizontal Position
The projection lens and the screen type determine the vertical and horizontal position of your
projector in relation to the screen. Ideally, you should position the projector perpendicular to the
screen to make the image appear rectangular instead of keystoned (trapezoidal). You can offset
vertical position of the image (move it above or below the optical axis) by adjusting the lens mount.
The type of projection lens you install determines the amount of available vertical offset. Vertical
offset can be expressed as the percent of half the image height or the number of pixels of shift from
lens center.
i
Use the lens and screen size to calculate the precise throw distance. Due to lens
manufacturing tolerances for lens focal length, actual throw distance can vary ±2% between
lenses with the same nominal throw ratio.
Lens Throw
Distance
Offset Percentage
(Offset Pixels)
Specified Throw Distance Range
Horizontal
Vertical
Inches
Meters
left
1
right
1
up
down
Min.
Max.
Min.
Max.
0.68:1
±10%
±25%
28
83
0.7
2.1
1.28 – 1.71:1
60%
100%
150% 100%
59
213
1.5
5.4
0.80:1
60%
100%
100% 100%
28
102
0.7
2.6
Throw ratio = throw distance ± 2%
screen width
% Offset = # of pixels of offset x 100
half vertical panel resolution
