Z Nikkor 50/1.2S vs. 50/1.8S

[Nikfuson]

Got the two to compare and first off a vignetting test.
In-camera vignetting control turned off and focus at infinity.

[Nikfuson]

Focus shift at close range (ca. 1m).
The red dot next to the bar code for reference.

[Airy]

Strange outlier at f/1.8. If real, it is easy to avoid that stop.

[Nikfuson]

Strange outlier at f/1.8. If real, it is easy to avoid that stop.

I see now that I put the red dot in the wrong place in the 1.8 sample. Will correct it.

[Akira]

To my eyes, the point of focus (not the red dot) remains the same at f1.8 and smaller.

[Jack Dahlgren]

I see now that I put the red dot in the wrong place in the 1.8 sample. Will correct it.

I agree. Think the true point of focus is slightly above the red dot, almost to the bar just above the one indicated.

[Nasos Kosmas]

I agree. Think the true point of focus is slightly above the red dot, almost to the bar just above the one indicated.

Yes corresponds to number 3 not 0

[Nikfuson]

I agree. Think the true point of focus is slightly above the red dot, almost to the bar just above the one indicated.

The red dot was just meant to be a reference, not at the exact point of focus.

[Nikfuson]

Here is the 1.2 at long distance focus. Vignetting correction applied to ease judgement of sharpness.

[Nikfuson]

So, what is the practical optical difference one might ask? Shallower DOG...eh, DOF.

[Nikfuson]

Here the 1.2 version.

[Airy]

f/1.2 would better suit short-nosed dogs.

[Nikfuson]

"Portrait" shot with the two lenses.

[Nikfuson]

Ball games.
First the 1.2, then the 1.8 at full openings.
Then both at 2.8.

[Nikfuson]

2.8