Lens Shift And Offset Matrix - Barco F50 User Manual

5. Installation
5.8

Lens shift and offset matrix

Adjusting the horizontal and vertical position of the image
Ideally in any installation the projector is positioned totally perpendicular to the screen to ensure a wholly rectangular image. How-
ever, physical limitations mean that this is not always possible to do and the result is a trapezoidal effect upon the displayed image.
One way to correct this is by adjusting, or shifting, the vertical or horizontal position of the image.
The amount of available vertical or horizontal offset is dependent on what type of lens is installed in the projector and the projector
resolution, see image 5-9 which illustrates the vertical offset values of an image. The same theory applies to horizontal shift. The
middle of the image is the optical axis (0%), i.e. no shift. 100% shift equals half of the image height.
On axis (0% shift)
H
Front elevation
Image 5-9
Vertical Lens Shift Formula
Vertical shift = Screen Height x (Max. Lens Shift Vertical (%) ÷ 2) ÷ 100
If the screen is 1.2 meters high and the vertical lens offset value is +120% to +150% (min/max), then the vertical lens shift will be
0.9 meters. This means that the (centre of the) image can be shifted up or down a maximum of 90 centimeters.
Calculation: 1.2 * (150 ÷ 2 = 75) 75 ÷ 100 = 0.9
Horizontal Lens Shift Formula
Horizontal shift = Screen Width x (Max Lens Offset Horizontal (%) ÷ 2) ÷ 100
If the screen is 4.2 meters wide and the horizontal lens offset value is +42%, then the horizontal lens shift will be 0.89 meters. This
means that the (centre of the) image can be shifted left or right by 89 centimeters.
Calculation: 4.2 * (42 ÷ 2 = 21) 21 ÷ 100 = .89
0% Lens Shift equals on axis (i.e. no shift). 100% Lens Shift equals half of image height / width.
F50–series offset matrix
The following table shows the available offset for each lens by projector resolution.
EN57
1080
Vertical +120% to
+140%
Horizontal +/- 4%
WUXGA
Vertical +116% to
+130%
Horizontal +/- 4%
Panorama
Vertical +120% to
+200%
Horizontal +/- 4%
WQXGA
Vertical +116% to
+132%
Horizontal +/- 4%
40
W
EN53 EN55
0 to +18% 0 to +108%
+/- 6% +/- 42%
0 to +6% 0 to +86%
+/- 2% +/- 40%
0 to +92% 0 to +210%
+/- 22% +/- 58%
0 to +30% 0 to + 110%
+/- 12% +/- 52%
-100%
0%
+100%
Side elevation
EN52 EN56
0 to +84% 0 to +108%
+/- 32% +/- 42%
0 to +66% 0 to +86%
+/- 30% +/- 40%
0 to +180% 0 to +210%
+/- 48% +/- 88%
0 to + 88% 0 to + 110%
+/- 40% +/- 52%
On axis (0% shift)
EN51 EN54
0 to +132% 0 to +130%
+/- 54% +/- 54%
0 to +110% 0 to +106%
+/- 52% +/- 50%
0 to +212% 0 to +212%
+/- 72% +/- 70%
0 to + 142% 0 to + 142%
+/- 64% +/- 64%
601–0307–00 F50 25/02/2016