Sharpness at 90mm

For these sharpness tests the Fujifilm XF 90mm F2 R LM WR lens was attached to a Fujifilm X-T1 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 90mm

The centre is remarkably sharp wide-open at f/2, with peak performance achieved in the f/2.8-f/8 range. Diffraction is only really noticeable at f/16.

The edges are slightly soft from f/2 through to f/2.8, sharpening up sufficiently at f/4, with f/8 the optimum setting.

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