Fisheye Image Enclosing Slide Bar
What does the Fisheye Image Enclosing slide bar do (In PW4)? It's not mentioned in the documentation. I understand the concept of enclosing the image inside the yellow circle, and using the Center X, Y and Radius to adjust the circle, but I've not figured out what the slide bar is for. It seems to auto-fit the circle, but the number that it's on doesnt make any sense.
Is that like 100 presets and you can use the bar to select from any of them?