Made between 1973-1978
First as with the Non Ai mount but was made with the Ai mount between 1977-1978.
Some exterior changes was made during the year of production but the optics remain the same.

It was also a really expensive lens and because of this quite few was ever made.
Apparently around 2500 non-Ai and less than 1000 Ai version was made.

Specs:



Image quality

Some pictures was made using a built in filters and has more contrast and detail in the sky.

Build quality

Built to the highest mechanical standards so it's really good.


Conclusion

Hard not to love a amazing lens like this.

It has great image at all apertures and the build quality it top of the line.
Hardly no distortion which is impressive on such a wide lens.
Plus the built in filters are also very welcome and can be very useful if you use b&w film.

However it's not a very fast lens and the viewfinder gets quite dark because of this.
Focus aid on a older SLR made for manual focus don't work very well at f/5.6
Not exactly a problem because next to everything is still in focus even wide open.

Lenses as wide as this do often prone to flare and this is not an exception.
Have found that direct flares have looks quite good but backlight conditions can sometimes be a problem.

This is also a quite rare lens and are usually expensive.
But on the other hand any high end super wide lense rarely comes cheap, new or old.


Thumbs up:
Image / Build quality
Renders
Built in filters


Thumbs down:
Biggest aperture of f/5.6
Quite rare and expensive
Backlight



Technical Info

Analogue B&W film
Scanner: Plustek OpticFilm 7600i
Film: Kodak Tmax 100
Developer: Kodak Xtol