This is the result of my latest Blender videotutorial: Easy & quick concentric circles. https://www.youtube.com/watch?v=pLdMvAZxg9w For CC 0 images visit my blog over at cczeroart.blogspot.com or download a render of this at: https://pixabay.com/en/circles-abstract-composition-render-1199179/
Thanks so much, exactly what I was looking for, and SO simple once you know this trick.
If like me, you want equally spaced (not proportionally) circles, then the procedure is similar, but instead of duplicating, simply create additional circles in edit mode, manually setting the radius each time to an increasing amount.