Sharpness at 30mm

For this test, the Fujinon XC 15-45mm f/3.5-5.6 OIS PZ lens was attached to a Fuji X-A5 body, which in turn was mounted on a sturdy tripod. Exposure delay mode was activated and focus is set to the middle of the frame. Tonal and colour variances across the crops are due to changes in natural light during the session.

The full frame at 30mm

The maximum aperture at 30mm (45m equivalent) is f/4.5. In our test, f/8 appears to be the sharpest aperture, though f/5.6 and f/11 are very sharp too. 

At f/4.5, f/16 and moreso at f/22, edge detail is slightly softer and there is less contrast. However, images at these settings are still sharp. 

There is little compromise the further from the centre of the picture. Again, image sharpness remain impressively high. The maximum f/4.5 aperture is the softest in this corner sharpness test, but again partly due to a limited depth-of-felld. In the corners, even f/22 looks quite sharp.

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