Optoma OMA-S User Manual page 18

SETUP AND INSTALLATION
‡ Make sure the Auto Keystone function is On in the Display > Geometric Correction menu to vertically
adjust image distortion caused by tilting or moving the projector.
Note:
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18 English
Display > Geometric Correction
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Auto Keystone
Ensure that the projector is positioned at the following specifications:
a. The projected surface is flat and perpendicular to the ground.
b. The projector is placed at 80-350 cm away from the projected surface.
c. Horizontal and vertical keystone correction is within ± 20 - degree range.