Optoma ZU1100 User Manual page 24

SETUP AND INSTALLATION
Boresight adjustment
Boresight adjustment is needed if the image is still unsharp after the focus adjustment. The boresight adjustment
tilts the lens holder to parallel the lens plane and the DMD plane to fully focus the image on the screen.
24 English
OR
L shape socket tool (black)
or U shape socket tool
(black)