I'm having problems with jargon here, so, I have a question, or more like a clarification. (I seem to have forgotten a lot of stuff from school-- sigh.) There was a time I used petroleum jelly over this filter that I have (I dunno what kind, though. It really doesn't do much to the photos so I use that so I don't mess up the lens.) to produce this misty/cloudy effect on selected areas of the frame. Does that qualify as a diffuser?