I'm looking to get a 3.0 ND filter so I can do long exposures in daylight, but unfortunately I have two lenses of different sizes and soon will add a third of yet a different size. Does anyone use one of these adapters? How well does it work. Also, how much of a set up is reasonable, i.e. can I use a 52mm filter on a 72mm lens? I suppose it depends on the lens and the zoom setting, but what's a good rule of thumb? The larger lens of the two-72mm is a long focal length zoom and if I needed to use the wider angle end of it, I would probably use the 52mm lens, does this buy me more step up room?