Sharpness at 28mm

For this test, the Nikon Z 17-28mm f/2.8 lens was attached to a Nikon Z6 II body, which was in turn mounted to a sturdy tripod. Exposure delay mode was activated. Tonal and colour variance across the crops are due to change in natural light during the session.

The full frame at 28mm

Center sharpness is outstanding between f/2.8 and f/11. At f/16 sharpness is beginning to drop off a little due to diffraction. Edge sharpness is best between f/5.6 and f/11.

Aperture	Centre Crop	Edge Crop
f/2.8
f/4
f/5.6
f/8
f/11
f/16
f/22