This ai version was made between 1978-1981 and was after this made with the ai-s mount which is still being made today.
The optics have never changed but the ai-s version has a 9 bladed aperture.

Specs:

Focal length: 50mm	Weight: 395g
Optical design: 7 elements in 6 groups	Mount: Nikon F-mount (ai)
Aperture: f/1.2 to f/16 7 bladed aperure	Covers: Standard 35mm film size (24×36 mm negative)
Closest Focus: 0.5m (1.7ft)	Filter Size: 52mm (non-rotating)

Image quality


Build quality

Like most NIKKOR lenses this is very well made.
All metal and are very well put together so it's solid as a rock.


Conclusion

This have been one of my favorite 50mm lenses for some time now and I love it.
But that's not to say that it doesn't have its problems.

Sharpness is quite good even wide open and are well corrected it is for a flat focal plane.
So not much corner softness but do have some color fringing and a lot vignetting.
Glow can also get quite noticeable and this gets worse the closer you focus.
However stop it down to f/2 and you can get a really clean and good quality image.

Bokeh looks great wide open or stopped down but would guess that the 9 bladed ai-s version would have a slight edge over this 7 bladed.

Usually not crazy expensive compared to many other f/1.2 lenses sold new today.
This is also a bit to the heavy side and many of the standard f/1.8 lenses have about half the weight.
However 395g for a lens like this is not too bad and some are +500g.

Also like that it still uses the Nikon standard filter size of 52mm.
Makes things way easier when you don't need to have filters with different sizes etc.


Thumbs up:
Image quality
Build quality
Bokeh
52mm filters

Thumbs down:
Glow wide open

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Technical Info

Analogue
Camera: Nikon FE2
Scanner: Plustek OpticFilm 7600i
Film: AGFA CINEREX (X-ray film)
Developer: Kodak Xtol

Digital
Canon 500D with lens mount adapter