Sharpness at 27mm

For these sharpness tests the Fujifilm 27mm lens was attached to a Fujifilm X-M1 body, which in turn was mounted on a sturdy tripod. Slight tonal changes are due to slight changes in natural light during the session.

The full frame at 27mm

The centre is remarkably sharp wide open, with peak performance achieved in the f/4-8 range. Diffraction sets in at at f/16.

The edges are soft though from f/2.8 through to f5.6, only sharpening up at f/8, with f/11 the optimum setting.

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