Sharpness

Sharpness at 50mm

For this test, the Sony DT 50mm F1.8 SAM lens was attached to a Sony A77 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 50mm

Centre sharpness remains high through from f2.8 to f/11, with f/16 and f/22 being adversely affected by diffraction. The edges aren't nearly as sharp as the centre, with f4-11 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