That led to a problem that another user was having here which prompted another user to post at the bottom of a simpler setup to achieve very similar results.
However a problem persists with both, the second opting to just cover the biggest problem with black, which is that it creates a sphere/oval distortion area but leaves the outer area of that shape with blurred colors of the shape’s edges to the end of the viewport. My other problem is that no matter which settings I change, the distortion field is off; by that I mean it’s suppose to work from the center of the screen and pinch it towards/from a circle but the problem is the center isn’t exactly the center of my viewport.
I’d expect the point directly between the top left and bottom right of the 3d view box to be the center, but the effect treats a different area as the center, like the bottom-right point, or a bit towards the right from the middle.
The solution for both of these that I need is to make these filters work from the center of my viewport, and extend the resulting distortion to have the edge(s) of the the sphere/oval be outside the viewport area.