Sharpness at 30mm

For this test, the Fujifilm GF 20-35mm F4 R WR lens was attached to a Fujifilm GFX 100S 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 30mm

Centre sharpness is impressively high throughout the entire aperture range, with peak performance between f/5.6-f/16.

Corner sharpness is also excellent, producing optimal sharpness at f/5.6-f/11.

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