Sharpness at 90mm

For these sharpness tests the Fujifilm XF 50-140mm F2.8 R LM OIS WR lens was attached to a Fujifilm X-T1 Graphite Silver 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

At 90mm the centre is remarkably sharp wide open, with peak performance achieved in the f/4-f/11 range. Diffraction sets in at f/16 and gets worse at f/22.

Eged performance isn't quite so good, with the best results obtained from f/5.6-f/11.

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