Sharpness at 35mm

For this test, the Samyang AF 35mm F1.8 FE lens was attached to a Sony A7 III 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 35mm

Centre sharpness is slightly soft wide-open at f/1.8, but excellent from f/2 all the way through to f/11, with f/16 and particularly f/22 being adversely affected by diffraction.

The edges aren't quite as sharp as the centre, with f/2.8 to f/11 producing the sharpest results.

Aperture	Centre Crop	Edge Crop
f/1.8
f/2
f/2.8
f/4
f/5.6
f/8
f/11
f/16
f/22