Take over the Jungle Camp..

[AJJY]

I tried night combat, I am litlebit confused.
I did cheat (console cgl 14 to buy Vintorez, subsonic ammunition and night googles), but I did not get Splinter Cell type combat. I am quite confused about scopes in night.
So some questions:
1) How good in night are night googles. What is their angle of view?
2) How does work night scopes? Are they weaker then night googles?
3) How much is affected by eyesight skill?
4) How does work standard scopes in night?

Sometimes I went out with NG on and spot some enemy. Then I switch out NG that I can shoot at enemy through night scope, but I can not see enemy through night scope which I can see through NG.

Sometimes I am searching enemy with weapon ready and do not see enemy through night scope even few meters away. Ones in old mines I spot enemy, but lost it. Tried to follow his path till stuck on path. Though that just another path-finding problem, but when I went back and turned again, for my surprise and disappointment, I was stuck in ... enemy solder (my stealth skill is high...)...

So can somebody explain night combat? Night scopes, night googles, eyesight, range and angle of view.