Sharpness

Sharpness at 10mm

For these sharpness tests the Nikon 10-24mm lens was attached to a Nikon D7000 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 100% crops represent about 1/400th of the total frame area.

The full frame at 10mm

At 10mm the centre is remarkably sharp wide open, with peak performance achieved in the f/5.6-8 range. Diffraction sets in at around f/11, with its effects becoming more visible at f/16, but the only aperture setting you'll want to avoid is f/22.

The edges are somewhat soft at f/3.5 but sharpen up very nicely at f/5.6, which is the optimum setting.

Aperture	Centre Crop	Edge Crop
f/3.5
f/5.6
f/8
f/11
f/16
f/22