This is a rebadged Tokina, manufatured in the 60's when Tokina was primarily an OEM supplier. Tokina was founded by a group of Nikon engineers and so the excellent build and performance of this lens is no surprise.

It's an early pre-set design, where you have two dials that control the aperture. One to pre-set the desired aperture stop, and a second which closes down the aperture blades to the "pre-set" stop.

The build quality is excellent and sturdy with zero slop, and focus is smooth and well dampended. Though it's a little soft wide open at f4.5, (which is good for soft skinned portraits), things get really sharp at f5.6 and up.

It's also light and well balanced and so a joy to use. Even though it has a tripod colar, I didn't bother with it and shot hand-held, in evening light with good result.

Surprisingly I was able to snap off this shot of white tailed deer at f5.6, ISO 100 and a shutter speed of 1/100. I should have shot at 1/250 and yet was surprised at how sharp the result:

Full image.

100% crop

The aperture consists of 18-blades, which gives that perfectly round bokeh (out of focus areas).

The only downside is some very aparent chromatic abberations (purple fringing), which is easily removed with software.

CA left, removed right.

For an old pre 70's lens it's a keeper.