Sharpness at 85mm

For this test, the Sony FE 85mm f/1.8 lens was attached to a Sony A7R II 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 85mm

Centre sharpness remains high through from f/2.8-f/11, with f/16 and esepcailly f/22 being adversely affected by diffraction. The edges aren't quite as sharp as the centre, with f/4-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