How to remove fog in scopes

I know some people already know this but, to remove the annoying fog around the scope, all you need to do is...
1. Extract the focus files (e.g. DOTSIGHT_FOCUS_A)
2. Edit it with photoshop or GIMP2 by filling the layer with white.
3. Save it, inject it and now the fog is gone!

Yes, it is that easy...

II used black to get rid of the fog.

Now tell us how to get rid of the fog when sniping in far distances