I'm trying to figure out what the big deal is versus the regular current super angulons and symmars. I get that in the overlapping focal lengths like 150mm, you get a larger image circle. Ok. But if you look at the 80mm, it has a smaller image circle than the 72mm super angulon. So I don't really get it. Do the aspherics offer any other real advantage? A few of them are way expensive. I'm confused.