That Vivitar lens was made by Kino Precision and many other Nikon-fit Kiron or Vivitar lenses from the period will have the same (single screw) fork. Here's one that sold for US$2.50 recently:
Why would you want a Nikon AI rabbit ear? If you need the ear then your camera is pre AI and a pre AI ear would work fine. If your camera is AI then you don't need the ear.
My lens is AI, but with my Nikkormat, I have to use stop down metering with the prong missing.. That isn't my idea of "works fine:.
I suppose I can get buy without one--if I have to, but I'd prefer full aperture metering. Wide open, the lens is only f2.8.
The pre AI prong impedes visibility of the aperture numbers on the AI lens.
My lens is AI, but with my Nikkormat, I have to use stop down metering with the prong missing.. That isn't my idea of "works fine:.
I suppose I can get buy without one--if I have to, but I'd prefer full aperture metering. Wide open, the lens is only f2.8.
The pre AI prong impedes visibility of the aperture numbers on the AI lens.
I know what I want, thank you very much.
There are no forks on eBay at the moment, but if I can't stir one up here, my plan is as outlined by Heritage camera.