haha... well, sorry, english is my first language so probably I used the wrong word while explaining about the light source... it is not the moon, it is a street lamp standing somewhere far away. Because of not focusing on the street lamp the light was blurred and that's the reason of the haloing - and the size of it.
I wonder how would the real moon had been if using it for the light source... probably something similar. I don't think a higher F number would have given me a better "focused" result: the light would have probably been reduced to it's real size, probably for a completely different concept. But perhaps the moon would have been easier to blur out... trying to blur the street lamp I used only gives me "light circles"
glad you liked it