Runco VX-4000ci User Manual

Page 16

Lens Option 5: Throw Distance 3.60 - 5.70 x Width of Screen

When only Vertical or only Horizontal Shift is used:
Maximum. Vertical Shift = 85% of screen height (.85 x height)
Maximum Horizontal Shift = 40% of screen width (.4 x width)

Amount of Horizontal Shift when Vertical is @ maximum:
Maximum Horizontal Shift = 5% of screen width (.05 x width)

Amount of Vertical Shift when Horizontal is @ maximum:
Maximum Vertical Shift = 10% of screen height (.10 x height)

Explanation:

• 0% shift is when the image center is even with the projector lens center - also known

as zero-degree projection-angle

• Shifting beyond the maximum values above will cause image loss in corners or edges
• When Vertical Shift is maximum, Horizontal shift can only be adjusted 7% left or right

in example above

• The maximum diagonal movement of the image is expressed as shift in 2 directions,

this is the maximum combination of adjustment (ex. Up & Left, Down & Right, Up &
Right, Down & Left)

• Throw distance does not affect image quality
• Lens shift does not affect image quality if within above limits

Example: 56" x 100" Screen
TD = 360" to 570" lens to screen

0.85 X 56" = 47.6" up or down
0.40 X 100" = 40.0" left or right

0.05 X 100" = 5.0" left or right

0.10 X 56" = 5.6" up or down

Normal Projection Position

120% or 67.2"

71% or 71"

Lens Option 6: Throw Distance 0.67 Fixed x Width of Screen

When only Vertical or only Horizontal Shift is used:
Maximum. Vertical Shift = 15% of screen height (.15 x height)
Maximum Horizontal Shift = 10% of screen width (.1 x width)