Ask Proxima A3100 Manual page 19

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 Picture menu
Change aspect ratio to 4:3 or 16:9 in Basic
Picture>Aspect ratio menu
18
http://www.pureglare.com.au
Result
Square image
Correct image
Correct image