Sharpness at 20mm

For this test, the OM System M.Zuiko Digital ED 20mm F1.4 PRO lens was attached to an Olympus OM-D E-M1 Mark III 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 20mm

Centre sharpness is excellent wide-open at f/1.4 through to f/11, with f/16 being adversely affected by diffraction.

The edges are almost as sharp as the centre, with f/2 to f/11 producing the sharpest results.

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