Sharpness at 7mm

The sharpness tests for this review were carried out using a real-world subject rather than a test chart. The Olympus M.ZUIKO Digital ED 7-14mm f/2.8 PRO f4-5.6 lens was attached to an Olympus OM-D E-M5 Mark II compact system camera, which in turn was mounted on a sturdy tripod. The self-timer was used to avoid any vibrations from pressing the shutter release. Slight tonal changes are due to slight changes in natural light during the session.

The full frame at 7mm

Center sharpness is outstanding between f/2.8 and f/11. At f/16 and f/22 sharpness is beginning to drop off due to diffraction. The edges aren't quite so sharp, with the best results achieved by stopping down to f/5.6.

Aperture	Centre Crop	Edge Crop
f/2.8
f/4
f/5.6
f/8
f/11
f/16
f/22