CiBest BL58 Bedienungsanleitung Seite 5

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the projection screen for the purpose of reduction of picture distortion during setting of the
projector position. If the angle of deviation of the projector from the central vertical line exceeds
20 degrees, picture distortion will occur.
4.3 Picture correction
• As the central projection axis isn't perpendicular to the projection screen when the projector is
installed, the projected picture shapes like a trapezium on the projection screen. In this case, you
need to rotate the trapezium correction knob until the picture returns to its normal shape, i.e.
rectangle.
• If the trapezium of the projected picture isn't corrected, the upper or lower part of the screen
may be unclear.
5. How to adjust the clarity of image?
5.1 How to focus the projected picture?
Rotate the focusing ring on the projector until the projected picture is in focus and becomes clear.
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Focusing ring
5.2 Warm Tips:
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