Guys, guys..
I've got it to work!! You'll only have to add a tiny delay.
Tank3 fire "HellfireLauncherM2A2"
~0.01
_Rocket = NearestObject [Tank3,"AT3"]
_camera camSetTarget _Rocket
_camera camSetRelPos [0,10,1]
_camera camSetFOV 0.700
_camera camCommit 0
Now it works like a charm.
Thanks a lot for that tip Killswitch.
VERY usefull indeed
*Topic solved n' locked*