Operation Manual

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65
ADDITIONAL INFORMATION
Calculate lens offset
The vertical image offset (shift) ranges for the projector are +/-120% (WUXGA) and +/-140% (HD). The horizontal
image offset (shift) range for the projector is +/-50% (HD/WUXGA).
The method for calculating lens offset complies with Industry standards. Example for Vertical lens offset:
 At 0% offset (or on axis), the center of the image is on the lens center, so that half of the image
appears above and half appears below the lens center.
 At +100% offset, all (or 100%) of the image will appear above the lens center.
 The % offset is calculated as the ratio of the number of pixels shifted up/down to half the image size.
Examples for WUXGA:
± Shifting up 600 pixels gives offset of 600/600 * 100% = 100%
± Shifting down 600 pixels gives offset of -600/600 * 100% = -100%
± Shifting up 720 pixels gives offset of 720/600 * 100% = 120%
± Shifting up 240 pixels gives offset of 240/600 * 100% = 40%
WUXGA Projectors:
Vertical Image Offset: 0% Offset (WUXGA)
No offset is applied - 0% offset.
Half of the image appears above lens center
and half of the image appears below lens
center.
Lens center
600 pixels
above lens
center.
600 pixels
above lens
center.