i tried it at BIS forums, but it seems that nobody knows how to fix this.
a pic first:

i think you see what the problem is: you can't see the dust... it appears only when i'm very close to the model like on the pic. when i'm away, i can see the dust.
so it has to be a bug in the first LODs... any ideas?

the question is why i don't see the dust which is between "the virtual photographer" and the tank...
two more pics.
it looks like this:

but it should look like this one:
