Sharpness at 23mm

For these sharpness tests the Fujifilm 23mm lens was attached to a Fujifilm X-Pro1 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 23mm

The centre is remarkably sharp wide open, with peak performance achieved in the f/2-8 range. Diffraction sets in at f/16.

The edges are soft though from f/1.4 through to f2.8, really sharpening up at f/4, with f/8 the optimum setting.

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