Acer PD126D series - Manual (Page 24)

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User Controls
Image
(Computer Mode)
Keystone
Adjust image distortion caused by tilting projection. ( 15 degrees)
Aspect Ratio
Use this function to choose your desired aspect ratio.
Auto : Keep the image with original width-height ratio and maximize
the image to fit native horizontal or vertical pixels.
16:9 : The input source will be scaled to fit the width of the screen.
4:3 :
The input source will be scaled to fit the projection screen.
480p : Crop a 480p video signal to 800x480 resolution (for SVGA model).
Projection
Front-Desktop
The factory default setting.
Rear-Desktop
When you select this function, the projector reverses the image so you can
project behind a translucent screen.
Front-Ceiling
When you select this function, the projector turns the image upside down
for ceiling-mounted projection.
Rear-Ceiling
When you select this function, the projector reverses and turns the image
upside down at same time. You can project from behind a translucent
screen with ceiling mounted projection.