Christie Mirage 5000 User Manual download pdf (Page 10)

Section 2: Installation and Setup

2-6

User’s Manual

Figure 2.1. Estimating Throw Distance

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 will appear rectangular

instead of keystoned (trapezoidal).

The vertical position of the image can be offset – that is moved above or below the

optical axis (lens center) by adjusting the fully motorized lens mount with the keypad.

The amount of vertical offset available depends directly on the lens installed in the

projector and can be slightly limited if horizontal offset has been applied. Vertical

offset can also be expressed as the percent of half the image height OR the number of

pixels of shift from lens center. Refer to Figure 2.2 for some illustrated examples of

vertical offset.

Table 2.1 along with Figure 2.3 show the maximum vertical offset of a lens or

alternatively, how much of your projected image will appear above or below lens

center if the maximum vertical offset is applied using that lens.

Table 2.1. Lens Offsets

%Pixels%Pixels%Pixels%Pixels

0.73:1 fixed 37% +/-196 69% +/-721 22% +/-153 61% +/-853

1.45-1.8:1 zoom 100% +/-525 100% +/-1050 50% +/-350 75% +/-1050

1.8-2.5:1 zoom 100% +/-525 100% +/-1050 50% +/-350 75% +/-1050

2.5-4.5:1 zoom 100% +/-525 100% +/-1050 50% +/-350 75% +/-1050

4.5-7.3:1 zoom 100% +/-525 100% +/-1050 50% +/-350 75% +/-1050

Maximum amount of

projected image to one side

of lens center

Lens Type Vertical Offset

(% of Half Height)

Maximum amount of

projected image above or

below lens center

Horizontal Offset

(% of Half Width)

% Offset = # pixels of offset / half panel resolution x 100.

1 2 ... 5 6 7 8 9 10 11 12 13 14 15 ... 143 144

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Christie Mirage 5000 User Manual Page 10