Panasonic TX-28DT30 Operating Instructions Manual page 16

ASPECT CONTROLS
Zoom1
Zoom1 will display 16:9 letterbox or
4:3 pictures with no
distortions
Zoom2
Zoom2 will display 16:9 anamorphic
letterbox pictures as a full screen
display with no aspect distortions
Zoom3
Zoom3 will display 21:9 letterbox
pictures as a full screen display with
no aspect distortions
16
aspect
Zoom1
Zoom1
Zoom2
Zoom2
Zoom3
Zoom3