Ah, i got it:

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