Whatever the reasoning behind the dual names, it appears it did not last long.
A decade? I don't remember. Today any piece of junk seems worthy of degrading the Nikkor name in favor of sales and profit.
I can't remember if I posted this above or not but I tried and sort of repaired a 50/1.8 Canon FD lens for a nephew. It was a piece of plastic junk and from what I've seen of the Nikon Series-E lenses they were much
A public relations customer who I printed for who turn in a lot of film with really bad image quality. She blamed her self. On day while printing I say the plane of focus was not parallel to the camera. I stopped by and check the lens and an element or group was clunking around inside. I took it to Gayson's Camera, Glendale, CA where she bought it and they shipped it to Canon. Canon repaired or replaced it free. There was no sign of impact or abuse. She asked me to test it when it came back. I found the image quality excellent. The build quality sucked! Same 50/1.8 Canon FD as my nephew's.
I wish these companies had more respect for their name. I wish Nikon still reserved the Nikkor name for their better lenses.