Sharpness at 35mm

The sharpness tests for this review were carried out using a real-world subject rather than a test chart. The Sigma 35mm F1.4 DG DN lens was attached to a Sony A7R IV camera body, which in turn was mounted on a sturdy tripod. Self-timer mode was activated. Slight tonal changes are due to slight changes in natural light during the session.

The full frame at 35mm

The centre is soft wide open at f/1.4, with the peak performance achieved in the f/2-f/11 range. Diffraction sets in at at f/16.

The edges are similarly soft at f/1.4, sharpening up somewhat at f/2, with f/2.8-f/11 the optimum settings.

Aperture	Centre Crop	Edge Crop
f/1.4
f/2
f/2.8
f/4
f/5.6
f/8
f/11
f/16