Sharpness at 16mm

For this test, the Sony Vario-Tessar T* FE 16-35 mm F4 ZA OSS lens was attached to a Sony A7R body, which in turn was mounted on a sturdy tripod. Exposure delay mode was activated. Tonal and colour variances across the crops are due to changes in natural light during the session.

The full frame at 16mm

Centre sharpness remains high through from f/4 to f/16, with f/22 being adversely affected by diffraction. The edges are just as sharp as the centre, with f/4-f/16 producing the sharpest results.

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