From the last post is this thread
Code:
  If you have a 16:10 display use the following line:
camera.aspect = (16/10) / (4/3);

This should work for any ratio like if modified like:
camera.aspect = (16/9) / (4/3); // For a 16:9 ratio
camera.aspect = (5/4) / (4/3); // For a 5/4 ratio



post thread

If I renember whell is out there other sample more better
but I don't know where are I can try continue to search in
the forum, but probably this sample are enought