InFocus IN5148HD User Manual page 16

Problem
Image not square
Image not sharp
Image does not fit 4:3 or 16:9 screen
Solution
Adjust Keystone on keypad
Adjust Sharpness in the Basic Menu
Change aspect ratio to 4:3 or 16:9 in Basic Menu >
Aspect Ratio menu
15
Result
Square image
FOCUS
ZOOM
SHIFT
Correct image
Correct image