Taking a look what we can do.
HiTech
*prays:  Please don't kill my what frame rates I still have.....
But at the same time disappearing trees and items, plus "hidden" things like that, are a serious issue.  I too would like to see the problem gone 

Another example is when you in a pintle mount and looking around things are clear when sliding in right next to a tree.  But if you zoom, suddenly you can't see through the leaves/bushes anymore because you are too close.  Affects main gun too, giving someone that can aim at range without zooming a distinct advantage in see the other person.
Thinkpad T-60, GMA 945 graphics.  Same effect under either WinXP or Windows 7.