Originally posted by Gooshin swirling a background layer while keeping the in-focus plane unaffected is a reather tedious process, and would require tremendous photoshop skill to do it seamlessly
It's not that difficult, and one can always save an action to replicate it endlessly from then on. The only trick is making the initial foreground selection, and there are many ways of accomplishing this efficiently.
But that rather misses the main point I was making. To put it plainer: why buy a lens that distorts the image in only one way, when one can buy a lens to take an "exact" image and then distort it as one sees fit, to suit the image? That's why I showed three different options. I chose the effects in each as artistic decisions; I do not want the lens choosing for me. That is limiting rather than freeing. Of course you may disagree; perhaps you like these sorts of limitations. But the whole point of this thread is to point out lenses we personally do not get.