Metro: Last Light may have just released in North America, but it wasn't exactly the smoothest one possible. Some PC gamers weren't overly happy with the field of view, as it's drawn in fairly close, which can lead to nausea and other lovely symptoms. Developer 4A Games wasn't too keen on fixing the FOV as it'd require redoing animations, cutscenes, and the like. However, something seems to have changed as there's now a new patch to allow vertical FOV adjustments in Metro: Last Light.
The method is a little crude, but it does get the job done. Gamers have to modify a setting in the "user.cfg" file located here: %LOCALAPPDATA%\4A Games\Metro LL\. Once in, look for the "r_base_fov X" line and adjust "X" to your desired value. Since you're adjusting the vertical FOV and not the horizontal one, this handy FOV Calculator can help you pinpoint exactly what you need.
AMD users are also getting some love from this patch, as it fixes a "shadow visual corruption bug" on all HD 7000 Series video cards as well as some TVs defaulting to a 3:1 resolution. Both of those are welcome fixes for the AMD crowd, as now they can enjoy Metro: Last Light without any abnormalities. Well, graphical ones at least, since some of the mutants and monsters you encounter are downright disturbing.