Sharpness at 60mm

For this test, the Sigma 60-600mm F4.5-6.3 DG DN OS Sports lens was attached to a Sony A7R IV 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 60mm

Centre and edge sharpness are commendably good wide-open at f/4.5, and remain high through from f/5.6 to f/11, with f/16 and f/22 being adversely affected by diffraction.

Aperture	Centre Crop	Edge Crop
f/4.5
f/5.6
f/8
f/11
f/16
f/22