Sharpness at 300mm

Our sharpness tests are carried out by photographing a real-world subject rather than a test chart. The Fujifilm XF 70-300mm F4-5.6 R LM OIS WR was attached to a Fujifilm X-S10 camera, which in turn was mounted on a sturdy tripod. Self-timer mode was activated to steady the camera completely. Any slight tonal changes you may see across the crops are a result of slight changes in natural light during the shooting session.

The full frame at 300mm

At the centre of the image, sharpness is excellent even at the maximum aperture of f/5.6. It maintains that level of sharpness until f/16, where it's slightly softer due to diffraction. It becomes noticeably softer again at f/22.

The edges aren't quite as sharp at f/5.6, with the best results obtained between f/8-f/11.

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