LENCO LPJ-500 Mode D'emploi page 10

Adjust The Vertical Location
Follow below picture to adjust the vertical location.
Adjust The Focus And Keystone
Follow below picture to adjust the focus and trapezoidal screen.
Adjust the focus by turning the adjusting wheel while observing the image pixels
near the center of the screen. Optimal focus is obtained when the pixels are
clearly visible. Depending on the projected screen size, the focus near the screen
edges may be less sharp than the screen center.
Keystone image is created when the projector beam is projected to the screen in
an angle. Keystone correction will restore the distorted image to a rectangular or
square shape.
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