The Nikkor 50mm f/1.2 AI is about character and speed more than convenience. For the longest time, it was Nikon’s ultra-fast 50mm option, and a bit of a running joke between Canon and Nikon shooters. Nikon users had to wait for the mirrorless Z system to see a modern 50mm f/1.2 again.

Wide open, it gives the distinctive glow, shallow focus, and imperfect magic people look for in fast vintage glass, so, in one word: soft. Stopped down, it becomes a much more disciplined, normal lens.

The AI-S version remained available new for a surprisingly long time, into the late DSLR / early mirrorless era, which is kind of crazy for a manual-focus lens. Whether you go for the AI or AI-S version, copy variation matters. Some are sharper than others, and buying online can be a bit of a lottery.

I bought my copy used from Japan and chose the AI instead of the AI-S for a lighter budget and because maximum sharpness wasn’t what I was after. Also, we have to remember that you do not buy an f/1.2 only to shoot at f/1.2. Sometimes the point is that an f/1.2 lens can look better at f/1.4 than a lens whose maximum aperture is already f/1.4.

The Good:

• f/1.2 gives a unique look and true low-light capability, even if it is not tack sharp wide open.

• Strong creative rendering wide open.

• Becomes much sharper when stopped down.

• Compact for an ultra-fast normal lens.

• Excellent tactile manual-focus experience.

• Beautiful to look through from the rear element when wide open — bonus point.

The Bad:

• Focus is unforgiving at f/1.2.

• Wide-open aberrations are part of the look, not a flaw you can ignore.

• Minimum aperture only reaches f/16.

• Image quality can vary depending on the copy.

• More expensive than slower 50mm Nikkors.

• Get it if you want character, speed, and shallow focus.

• Get it for night work, portraits, and atmospheric film images.

• Get it if you enjoy careful manual focusing.

• Pass if you want a simple, sharp normal lens.

• Pass if missed focus at wide apertures will frustrate you.

• Pass if you specifically want the more sought-after AI-S version and are not willing to pay the premium.