Microtek MS4 - Manual (Page 19)

Adjust the Zoom, Focus and Keystone
1.
Use the Image -focus con-
trol (on the projector only)
to sharpen the projected
image
.
2.
Use the Image -zoom con-
trol (on the projector only)
to resize the projected im-
age and screen size
.
3.
Use the Keystone buttons
(on the projector or the
remote control) to correct
image-trapezoid (wider
top or bottom) effect .
The keystone control ap-
pears on the display.