God rays, dynamic depth of field, night vision scopes & binoc, thermal/infrared goggles, rainbows, dynamic wet surfaces with reflections, and many other effects.
Not yet finalized, thus still a little unpolished but working: In DS 2.0 you will *finally* be able to (de-)activate the NV effect on scopes and binocs by key press ("on-demand").
WITHOUT having to install X-Ray Patch 1.0006 (thanks to DDraig)!!!
Same goes for thermal/infrared vision of course.