For those interested in a video sample of the vignetting, it will be available at Youtube as soon as Youtube finishes the processing.
Because the interest was in the vignetting and not in the glass quality I did not use super high quality so the video is somewhat compressed. Hope this helps. As you can see from the cropped 4K video (which was cropped from the video just before it) the vignetting provides very little to worry about. I still believe this is the most useful and highest quality set of filters I have bought and I have purchased filters from 3 different vendors besides Rainbowers.