I should note that on this and the other "dreamy" flower images shot with Nikkor lenses all also used extension rings in addition to the wide open large aperture lenses cited. The non-Nikkor flowers are using Kowa f/1.1 lenses, either 55 or 77mm focal length, without rings. Not sure what the Kowa lenses are actually intended for, but whatever the use may have been it's not this!