Sharpness at 50mm

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 50mm

At 50mm both the centre and the edges are remarkably sharp wide open, with peak performance achieved in the f/4-f/11 range. Diffraction sets in at f/11 and gets worse at f/22.

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